It's very hard, and I'm actually not sure if anyone other than Alexander Abt has landed it in competition. If that's the case, more people have landed the 4Lz-3T than have the 3A-3Lo (not that it's a measure of absolute difficulty, as the former combination is incentivized more in the scoring system). A skater needs good speed on the landing, and not too much height on the first jump, to pull off a 3Lo; most 3A's are jumped too big to pull off that combination consistently enough.
Loving the detailed explanations here, thanks so much. Question though, a couple people in this thread have mentioned the high chance of injury when doing a loop. Not being a skater myself, I was wondering what exactly makes loops dangerous? (Yuna Kim gave up on the 3Lo because of injury, as one well-known example.) And also, is a loop any more risky than other edge jumps? Thanks in advance.
Petr Gumennik did it at Nationals Elder Age just a week ago
She presented it recently during a challenge cup report
https://www.instagram.com/p/BhPRLvKhQj4/?hl=ja&tagged=wakabahiguchi
Wow, I completely missed this. Thank you!
This one is my favorite 3Lz+3Lo of all time: https://youtu.be/wFVDnlvLZig?t=4m43s
(This was the time when Ted Barton called her a "Princess Warrior.")