Somebody earlier said no attempt before Mroz was serious:
Look at this: https://youtu.be/ss8T7aGr9ZI
Nowadays this would be clean with little negative GOE.
He makes the rotation and only touches the other foot down slightly on landing.
As far as I'm concerned this is the first 4Lz (of course it isnt due to it not being counted (was uncalled after 1 week of being the first clean)).
Ah, a little like Krasnozhon having his quad loop attempt called rotated by an international tech panel at an ISU JGP and then a week later the ISU declaring it was not, because they wanted Hanyu to be first, not some lesser-known American Junior (as he was then).