There was a Twitter thread I read once (can't find it now

) that explained, with statistics, how skaters with very clear outside lutz edge are more likely to have a lip and viceversa for skaters with good flips having flutz.
Basically, it's very rare to find a skater who has both a "textbook" lutz and flip, and even more as the number of jump rotations increase.
I don't know if the ISU should try to be more strict about these details as obsessively as some fans are. Maybe it's one of those situations where you would potentially sacrifice technical development of the sport for the sake of being super strict about "correct" technique and you would end up giving out calls like candies.
In the end, the technical panel decides whether a lutz is a "real" lutz or not.