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I sometimes think Hubbard both believed and didn't believe a lot of his stuff, simultaneously. We are so used to thinking that believing and not believing are mutually exclusive, and that's how seems to be.....but I think hubbard could make shit up and not believe it somehow because it was just a social behaviour/manipulation etc, but also get caught up in it. If you are delusional, be careful of what you try to delude others with; I suppose that's how it goes.
I also think it is possible for all of us normal people

to believe and not believe something simultaneously. AFAIN this is not talked about much, but it may be a bit like memory, where we used to have ideas about how memory worked that are now being shown to be not at all accurate.
I think that with hubbard's wild make-it-up-as-you-go-along style, he just threw in stuff that he was "working on"/chewing over, with stuff he actually believed, with add ons that he would have considered pure fiction, motivated by his need to be an entertainer/manipulator etc. He did not give a shit which box he pulled stuff out of or how he threw them together. That was the mad part....maybe not autistic, but possibly with some misunderstanding about why other people do NOT do that.
I have a friend offline who did a lot of this stuff when I first knew him.
He doesnt do it much at all now, at least, not with me. But he is a manipulator rather than an up front negotiator.