To be fair, I don't think that he's saying it should be banned -- he's saying that we need a lot more testing before claiming this is a cure based on one study with a tiny number of participants. His statement is accurate.

And the quinine derivatives have some very subtle neurological effects that last a lifetime. Suicidal ideations -- for life and incurable -- are a well known side effect of mefloquine at least. Maybe this one doesn't have those effects, I don't know -- but there's a really good argument to do a lot of testing before taking this in any other than an in-extremis situation.