Checking the recent activities, the account has either been recovered by the real owner or hacked. Until there is any suspicious activity, all eyes will just be on the watch to see how and what's next with the account, if the real owner will make a post, or if it has changed hands.
I think Cyrus and team very well know that it's a high profile account. Do you think they would just let it slip into the hands of hackers just like that? Not even bitcoin signed message?
I personally don't think so.
Do I think? No, I don't think so, but is it possible for a high-profile account to be hacked? Well, nothing is impossible. One of the reasons why most high-profile accounts are locked, I believe, is because of suspicious cases like this. Old accounts might successfully be hacked but will later be discovered and caught if the person can't prove ownership. Like I said above, everything still appears to be normal, and there is no harm or price to pay to be careful and vigilant to see how the account will operate—that's if there will ever be any post from that profile.