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Are any facts knowable? Besides the fact that something exists, in some shape or form, at this particular moment, that allows the thought about this to happen.

Also that, yes. But I do see a space where the authors (and subsequent article writers) recognizing and acknowledging the limitations of proof would help them frame their arguments in such a way that they ultimately convince more people of not having seen actual ghosts.

It's knowable in a sense that hallucination/scam is vastly more probable than an actual ghost (or any other supernatural phenomena).

If there is a mistake in common knowledge, it's the belief that hallucinations/delusions happen only to mentally ill people or on drugs.