I don't buy it. Ok, I'm not a veteran ad spender, but the claim that after two weeks on Elon-Twitter the metrics shifted so drastically that it wasn't worth it doesn't make sense to me. If anything there's more eyeballs on Twitter than before.
I haven't seen an ad on Twitter in quite awhile, because I read single tweets linked to from somewhere else. I don't have an account, I don't have the mobile app, and I don't browse a feed.