They stopped to post 4 days before the invasion, this should indicate that whoever was using this account knew what would happen after. The sanctions in the UE have been this week, so thinking it slowly this indicates that was in fact RT's official account.

Putin saw crypto as a threat to his control over the trapped Russian economy.

Ironically it's the opposite thing and crypto should allow Russia to avoid most of the economical sanctions. Obviously nothing can replace the amount of companies leaving Russia though.