a fake moon rock of unknown origin apparently means all Apollo (and Luna) samples are also fake.
Fido is a dog.
Fido has fleas.
Therefore, all dogs have fleas.
QED
When I see an argument on the internet, on either side of an issue, in which the conclusion actually follows from the premises, I am extremely surprised. It's an extraordinarily rare event.
The particular fallacy that even many people with years or scientific or engineering training seem to love is that any argument with a true conclusion is valid. If you demonstrate that the world is round by a fundamentally flawed method, and someone points it out, then they're obviously a flat-earther.