I thought this man is against BTC, lol. So it looks like he changed his mind now? But, it's also possible that this is only a show-off, to get our sympathy, as he knew that we are lots of us who support BTC and against to the people who dislike it. Biden is more friendly with BTC but we never heard that he did a similar thing like this. Though like I said earlier, this can be too-good-to-be-true, so think a lot of times everyone before believing it.
Despite of it, I think the BTC community can still benefit with it because it was still a special type of promotion, since it's done by a big person. Even if the regular BTC is not the ones who are starring here but that's better because we always wanted to help the Lightning Network to gain more adoption.
What do you expect? It's election time again and even though he is already convicted, who knows, maybe he could still run for the office of the President again and so he has a lot of supporters that's why he chooses to accept donation via LN.
And it will be a big boost to him, if he portrays himself as a Bitcoin or crypto friendly President as compare to the administration of Joe Biden, who seems to be against Bitcoin and his party by all means. But it doesn't mean that LN will be adopted though just because Trump uses it, there is no correlation whatsoever.