not well known in conspiracy circles

You know, I've found this is how almost all secrets are really kept. It's not Holocaust-style "you are prohibited from questioning it", or Sandy Hook-style "you can't publish a book about it", or vaccine-style "you'll get strikes and shadow-banned if you discuss it". All of those give you something to point at and push against.

When it's handled in the way where it simply becomes "not well known", it's far more insidious. Even when you happen to brush up against such things, you may never really "get it" because the way the subconscious works is, "If this was important, people would have talked about it and I would have heard of it before."

"Not well known" comes from "hard to notice". You can see it in conspiracy circles, where almost everything these days is repetitions and additions and variations and examples of what has already made the rounds.

IDK if you've been following any of my posts lately, but the vast majority of the sources are Wikipedia. These things aren't secret at all, it's just that no one has noticed their importance.