I don't know if Elon Musk was ever "the hero of the left", or any tech executive for that matter? He definitely has his fans (among techies mostly), but you would be hard pressed for any hardcore leftist to see a CEO as their hero. The whole pedo thai diver incident turn even many left-leaning (and unaligned, and right-leaning) techies from pro to neutral or even negative.
Personally I consider it meaningless metric since almost all American tech companies are left-leaning, for various reasons.