They'll just move the goalposts. When my sister went QAnon crazy she started spouting all sorts of bullshit like the moon landing being fake.

I pointed this out to her, and she just insisted that later moon missions were real and planted evidence for the faked early ones. I also pointed out OP's point (if the landing was faked, the USSR would have called out that bullshit) but she insists she's smarter than the KGB.

I don't speak with her anymore.