I am a TL and I've been around 5 years. I play a lot of alternate shot, and I have played a number of rounds with players who I am sure are honest, and I'm sure can hit 54 on 1st, 2nd, or 3rd try on any course.
They don't cheat. Just great iron play and putting. Yiannis and fmagnets come to mind immediately, not to offend anyone by omission.
Cheaters exist, and WGT has been legitimately faulted for being too slow to catch them. But give credit to some talents where it is due.
With moderate winds and champ greens, I think my lowest score is 58, and that was a miracle. So I played 2017 VUSO one time, "won" my free avatar and will save my balls for other purposes.
At this point, I will just wait for using Erin Hills in club events. Most of players in our club who have tried it like it. (Not excusing loss of Oakmont.)