People have been burned time and time again by scientists over hyping stuff in the last 10 years, then combine that with the replication failures over nearly every single scientific field.
Then look at the extreme amount of business fraud in the last 10 years with places like Theranos and FTX
Hackernews is not infested with reflexive contrarians.
Hackernews has healthy amounts of skepticism and doubt.
Extraordinary claims require extraordinary evidence.