It's really convenient to use easily debunked stuff to prevent people from looking into other things. For example, "flat earth" is not designed to convince any

It's really convenient to use easily debunked stuff to prevent people from looking into other things. For example, "flat earth" is not designed to convince any normal person Earth is actually flat. Paradoxically, you just "fell for" the actual utility of the "we didn't land on the moon" stuff, sure you can find genuine people that believe just about anything, but that's just a side issue. This is very common if you study disinformation a bit.