Those are pretty different objections. Only one of them detracts from the theory.
I've read that we have pretty good data on how long a human can float in water of various temperatures before tiring and drowning, because the Nazis systematically drowned Jews in water of various temperatures to get the data.
I also read that relevant bits of this data are posted near beaches with cold water as a public safety measure. So far so good.
...and then of course, that there was a movement to take those signs down because the source of the data is morally objectionable. Full credit for moral purity to the let's-take-down-the-drowning-warnings people. In their own small way, they are dedicated to making the world just that much slightly worse than it was.
So that's a different claim.
When he first appeared he was credible - he got published in a peer reviewed respectable journal after all, and he was actively trying to con people.
Once his paper had been debunked, well, yes you're right there. There's no excuse to keep pushing his theory once we know he's falsified his data, taken samples illegally from people without their permission, etc.