The issue is that it is a doomsday cult if one is to expect extreme outlier (on doom belief) who had never done anything notable beyond being a popular blogger, to be the best person to listen to. That is incredibly unlikely situation for a genuine risk. Bonus cultism points for knowing Bayesian inference but not applying it here. Regardless of how real is the AI risk. Regardless of how truly qualified that one outlier may be. It is an incredibly unlikely world-state where the AI risk would be best coming from someone like that. No matter how fucked up is the scientific review process, it is incredibly unlikely that world's best AI talk is someone's first notable contribution.