I don't think so.
Plushenko has most of her attention on Sasha now, especially with Alyona's leave. Out of the four/five skaters who switched to Plushenko she's the one who improved the most. She's the one whose technique has gotten better, expression has gotten better, and programs have gotten better.
And I wouldn't say Trusova's skated below her potential everywhere but RusNats. She landed two quads at Stage 2 and 3 at Stage 4 and won easily at both. The only two bad competitions I would say are Rostelecom and Channel One Trophy, and even at Channel One she landed a great 4Lz+3T+1Eu+3S+3T and a 4T. If anything I would say she and Anya performed the same level there, with both downgrading a quad (Anya's probably wasn't called, but it existed) and some weak combos (3Lz+1Lo and 4Lz+1Eu+3S).
Now, with everything that's been happening I wouldn't be surprised if she left, but I still don't find it to be that plausible.
And what do you mean not one of his girls has delivered?
Sofia Muravieva at Junior RusNats? You could even say Sofia Muravieva at Stage 2 (she had one spin that went wrong but everything else was completely clean). Titova at Moscow Qualifiers? Titova at her other local competition (for reference, she got a 191 and she's only junior eligible 2022/23)? Even Shulskaya has done pretty good (not A tier skating but she's been landing everything and doing moderately well in placements).