It was the experts that you disdain with quotation marks, but the rest of us call scientists and engineers, who made Tesla and SpaceX, not Musk. It was not scientists and engineers who scoffed at the ideas of Tesla and SpaceX, but businessmen and other non-creators.

The ideas that Musk is promulgating through Neuralink are decades old; the technology he is using is hardly anything special. What scientists are pushing back on is the unrealistic timeframe Musk promises to achieve his scifi fantasies within, the consequences and repercussions of those technologies, and the short term effects of overselling and propaganda about these ideas, which are otherwise in fact valuable.