>Do you not believe grigori Perelman's proof of the poincare conjecture?
Yes, because his peers spent serious time checking it and found no flaws. Peer reviewed doesn't need publication in a journal.
>Do you believe in arsenic life?
No, because peers found it flawed.
You're conflating peer review with simply getting past initial peer reviews. The more peers that review a claim, the more likely it is correct. The flawed ones are almost always not reviewed much at all.
And I'd bet there is a significant gap in correctness between things that are barely peer reviewed over things that are not.