Yes it's true it got worse. But that's the way with that technique unfortunately

hwell: I used to think she did better than Trusova on the element - in total she's probably landed better rotated ones- but that second 4Lz is unfortunate.
There are a couple things Trusova does much stronger than Sherbakova in the Lutz related to the general mechanics:
Trusova does a deep outside edge, whereas Sherbakova has a flat edge (sometimes flat inside, sometimes flat outside).
This for me bothers me more than the extra prerotation - and probably actually causes the extra prerotation.
From a skaters perspective, I used to have a horrible Flutz. When I did this I could gain a lot more prerotation as my body weight was dropping more on my right foot so I could turn more before the takeoff. Once I fixed my edge, the prerotation was reduced so at worst I can say I do a half and at best I can take off before the quarter mark.
(Another thing is Sherbakova was getting less and less rotation on the lutz throughout the season, but wasn't getting called. To note, I think she is very underrated artistically - but that is another topic).
This next part is not directed at you in particular, but generally everybody commenting on the topic of prerotation.
Heres the thing when it comes to prerotation:
A heavily prerotated quad is still more difficult than a triple. It should not be punished by calling it a triple. Of course, those who take off with less pre-rotation should get more GOE than those who don't, but downgrading people who do 3.5 revolutions in the air like trusova to a triple Lutz - which at best usually has 2.75 revolutions should not happen.
Lutz and Flip are of course more difficult when you don't prerotate, but even when you do they are typically more difficult than at least toeloop and salchow (depending on where your strength lies) as you have very open hips on the toeloop allowing you to generate rotational velocity easier - I experience this on practice, as even when I landed my 3T nicely my 3Lz (with prerotation) was still quite underrotated and sketchy. With Salchow, the momentum from the throwing leg is a big help - and those who use throwing leg nicely on loop with good grouperation will also have this advantage.
I also know people who do not pre-rotate on Lutz who find it much easier than toe - This is due to naturally insanely fast twitch and getting into rotation very quickly - which is harder to do with pre-rotated jumps. Pre-rotation gets the power, but it also delays getting into rotation position which people tend to ignore.
Last thing to note, is that when I learnt doubles I didn't ever hear the term "prerotation used." I just learnt doubles by landing doubles - I didn't go to vidoes of jumps and watch them in 0.25 speed, I had no clue this was even a thing. I learnt a lot about prerotation 2-3years after - by the time the technique was ingrained in my body. My coach explained that it was good to prerotate a reasonable amount - as this allowed you to put more power in jumps. At this point I didn't prerotate on axel, so for 2A my coach had to teach me specific prerotation exercises to get as much out of it as possible.
Now, onto axel:
1/4 is the best of the best. Hanyu and Kolyada tend to do 1/4 within their mechanism.
Lets turn to ladies 3A - Alena Kostornia also does 1/4. I believe Rika does but haven't checked this out.
Without 1/4 prerotation 2A is extremely difficult. 1A is very doable. Without perfect rotation 2A is not. I've only seen one skater EVER land 2A without any prerotation or perfect rotation - and it was honestly the most insane thing I ever saw in skating. This skater went at top speed - and I'm talking close to Keegan messing speed and just threw all his power into the 2A - He just completed the jump in time and he had height enough for 3A and length enough for it too.
The reason for this is not that it gives you 1/4 less rotation to do, but it initiates the rotation on the takeoff. Otherwise, it takes ages to reach maximum rotation velocity, and you have to move at insane speeds to compensate for this. If you initiate the rotation on the takeoff, you get into the jump quicker and your maximum speed is much faster, and you reach it much quicker.
I'd say with just the 1/4 prerotation done correctly, he'd have been hitting 3 revolutions on the jump for sure. With half he probably would have been pushing triple axel.
I'm fine with people complaining about prerotation on axel, but if you do then complain about each skater equally - including men. Also a 3A with 1/2 prerotation is still much harder than a 2A with 1/4 prerotation - punish the jump with less GOE if anything but downgrading it to a double axel is a stupid system.
Have you ever heard anybody say "Alexei Yagudin had the best triple axel" - well he actually nearly did 1/2 prerotation on the jump. Not quite 1/2, but definitely more than 1/4. Have you ever heard anybody say "Alexei Yagudin's triple axel was easier than a double axel" or "Alexei Yagudin's triple axel should have been considered a double axel" - This statement sounds ridiculous, just saying it would raise eyebrows.