Trump-endorsed candidates underperformed in the midterms and in previous elections. Trump talking hurts the party. If anything, keeping him off the platforms until after the midterms helped Republicans.
Trump endorsees also underperformed in 2018 and 2020. There’s a pretty clear trend. Trump won in 2016 because of his reach on Facebook and Twitter, yes—he was novel and his win was a black swan. But he and his candidates also did poorly in subsequent elections, after the novelty wore off, because of his social media reach.