I dont think this is proof the account was sold, it is fairly good evidence it is for sale though.
Bruno has contributed a fairly decent amount to the community over the years and based upon the fact he is (trying) to sell his accounts he likely is in need of money. So I would ask both hilarious and darkstar if they want to actively prevent Bruno from raising money he likely needs by selling something he duly owns?
If that is truly the case, I am sure a few users would help him out to give/lend him some money?
Chances are two people have access to Gleb Gamow/Bruno's account because of
this, I have never seen Gleb post like this.