That's dishonest to link a single tweet and act as though that's all the claims he's ever made about it. Here's a single press conference[1], which isn't nearly the extent of it, and doesn't include his claims he's taking it himself, but does include a "What do you have to lose?" argument.

[1] https://www.statnews.com/2020/04/06/trump-hydroxychloroquine...