The first, yes. There is a lot of evidence that she can help athletes with consistency in training a program & being prepared. Though, actually, Shoma is usually pretty prepared relative to other men early in the season.
The second, perhaps? We will see. I don't think Trusova, Scherbakova, and certainly not Kvitelashvili are clearly more consistent on their quads than Shoma. Of course that probably depends upon which quad we are discussing. (And, thus far, we've no idea how consistent Tursynbaeva will be with hers).
Eteri has certainly shown the ability to help maximize points based on what one has. She also continues to raise the bar, though I'm not sure I can think of many cases where she has done this via the same individuals. Tursynbaeva is one, but usually it is the next young lady on the scene that raises the bar from this camp. It will be interesting to see what Eteri does do with Shoma if he goes there.
Though I am sad it sounds like he has burned his bridges with his previous coach. She deserves major kudos for helping him become one of a few competitive men in the world.