Cheating in any competition is nothing new even at the highest & professional level of competition.
I was away from the game for around ten years and I’ll say I’ve never heard of slicking the cue ball up with silicone. Not to say it wasn’t thing before then I have just never heard about it. But when there’s a will there’s a way when it comes to human beings. I remember as a kid my father and uncle would keep close tabs on each other’s cups of coffee when they were playing. If at least one of them did not have eyes on their coffee at all times they would simply get new cups and only drank cups that they could see getting poured.
I’m not siding with any of the accusations one way or another because I obviously don’t know but I did a little research on how to combat it if it actually is happening:
For pool tournament directors or serious accusations, a Dyne pen test is the most practical, affordable, and dependable method. It’s fast, simple, and visual. If legal or high stakes accusations are involved, send the cue ball to a lab for confirmation.