I'm pretty sure an outside view would say it is LWers rather than domain experts who are more likely to be wrong, even when accounting for the selection-confounding Carl Schulman notes: I don't think many people have prior convictions about decision theory before they study it.

I've noted it previously, but when the LW consensus are that certain views are not just correct but settled questions (obviously compatibilism re. free will, obviously atheism, obviously one-box, obviously not moral realism etc.), despite the balance of domain experts disagreeing with said consensus, this screams Dunning-Kruger effect.