Honestly, I'm not even totally on board with letting Anna or Liza perform here. As seen with Zhenya, Covid can have several lasting after effects and it's never safe to jeopardize your health for one competition that may not even matter. While I respect Anna and Liza's attitudes of perseverance, I really wish they could take proper time to train first. Alyona withdrawing if she feels unwell is in no way an invitation for anyone to say she simply wants to avoid being embarrassed, if anything it's a sensible decision made with her health and her future in thought.
I'm sure they along with their coaches and parents in Shcherbakova's case have assessed that they are well enough conditioned to skate, even perhaps a lighter program then what they usually do. Nothing in Shcherbakova's interviews indicates that she is going to rush this season, Eteri has the gold medal favorite, Valieva, and 2 well qualified to get a medal skaters so I dont think her coaches would be rushing her.