Rhetorical question: Greg Maxwell and Pieter Wuille (both ex-developers of Bitcoin Core) have also signed off messages to me with "Cheers", so how can we be so sure that the Casino Critique account is not operated by one of them?
We can't be sure of anything, but the question is who is behind the Casino Critique account.
If he were someone of impeccable reputation, like DarkStar_, he would use his main account to promote the project, not a newly created one.