I guess the counter-question would be: if something is undetectable and can't be described and interacts with nothing and has no impact, does it really meaningfully "exist"? It's the same as the whole simulation idea- you can't prove we're NOT in a simulation. But no rational person actually believes we live in the matrix. I know one guy in the thread said he did sort of believe this, but (sorry, not sorry) that's not rational. It comes down, I think, to how someone resolves not knowing something. Atheism seems to be ok with the unknown, where religion has to have an answer, even if there's no grounded basis for that answer. Is it a fear thing maybe?