My reasoning that he is mainly after the money is that in the past year he has been paying a lot of legal fees and fines, while trying to run a campaign. He had his NFT collection which made him a quick buck to then immediately floor in value, same for trump media stocks - except they then skyrocketed again, and now flooring again. So.. Just seems like something he'd do.
The 2nd reason is that crypto is a very divisive topic with loads of people hating on it - including banks and some other financial institutions. I'd expect it's a double edged sword for supporters, but maybe he's gaining more from it than losing in terms of votes.
Considering that it's been a few days since he made his statement and there hasn't been massive movement on BTC price, he's either not influential enough to impact it or I was wrong.