You can cheat 100% and everyone will clearly see that you're a cheater, or you can play well and only cheat in rare cases, like not taking damage from off-screen enemies, but only when you need it, not constantly. Both are cheating, but the second one is almost impossible to prove. That's why all records set on PC need to be devalued.

Twitch is full of scams. Especially in online games, and it's no secret that developers themselves adjust the balance for popular streamers with whom they have contracts.