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?
Judging by the message, and the supplied information it has already been sold Otherwise, why would the PM be within the time frame of the password changes[1], and Gleb was likely willing to verify that he was still in control to protect the buyer.
I would say there is a fairly decent chance it was sold, buy maybe not. The password changes indicate it likely changed hands, however the PM was sent after most of the changes. I don't think the password would change until after the account was sold, and I think these types of PMs would stop once the account was sold.
The only other explanation I can think of is the account sold to someone, and the buyer was trying to flip it.