Exactly, it always sounded as if Plushenko kept using that as an excuse for poor results or not showing up to competitions. Since Aliona or Rozanov never said anything and Plush is not the most reliable source of information, we really can't know how true it is that she's still struggling with covid after effects or if it's just stamina issues from lack of proper training.
I think Kosto can get the 3A back in the trial period. Even if she's injured, I don't think she has the type of injuries that would keep you off the ice completely for some time, like Medvedeva's.
I think the biggest problem is that she's out of shape and coaches didn't know what to do with her. And if Eteri asked to get the 3A back within the trial period, it's because she thinks it's an attainable goal.