i can confirm that a year ago, i was following a cheater and he was laughing at me...since then i ve banned many chinese esp hackers..mostly by using stash traps but i never saw someone react as like he can see me...

I'm sure they cannot, no matter what kind of magic their cheat has, Vanished players are unnetworked from other players.

Well they "the cheaters" can see admins in spectate mode, so i would think they can see vanish

I think they can... recently spectate a player reported by others, he acts "normally", go to your house an stay afk... every time i spectate