> Is this misinformation, wrongthink, or both?
You missed the fourth option: it's neither. No-one would call it misinformation or wrongthink; rather it's false, or a lie if you're feeling judgemental. I think the person you replied to has made a good point.
I remember being a little kid and watching a week long show about the JFK conspiracy on either one of the big 3 networks or PBS. Area 51 alien conspiracy is so ubiquitous I don't even know how you would track it 30 years ago.
Alex Jones that is banned from youtube for all these crazy conspiracy theories he puts out use to be on practically nationally on AM radio stations for hours a day. The Art Bell show was broadcast nightly for decades and was maybe even more insane than Alex Jones.
It is telling that the people who are weaponizing this concept of "misinformation" do not point it at all at Bigfoot researchers. What is more "misinformation" than the idea of giant apes running around the US forest? Of course, that doesn't count because there is no political gain to be had.
The whole process is so transparent.
We basically have epistemological certainty as long as their is political gain to be had from the certainty. JFK assassination is probably the best example. The theta/time decay has all evaporated on the political gain from the conspiracy so that no longer matters.