I don't think he'd need to prove himself, this video is proof enough he has woken up and is ready to take the journey to his own noticing.
We can do like the chans, tell him to put something that's not strange but obviously out of place in the background of his videos to signal he got the message and we can upvote and get him leveled real quick.
They did that with Felix (Pewdiepie) a while back when someone claimed to be him was shitposting around and he fucking did it, the mad lad.