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.
This isn’t to say I advocate for people being any of those things, it’s just somehow become generally accepted that these things are somehow inherently breaking the law or some kind of hate crime. Even on the rare instance someone displays some racist material in public, the news is quick to say police are investigating…investigating what, exactly? “Hate speech” is not a crime in the US.
Personally I consider it meaningless metric since almost all American tech companies are left-leaning, for various reasons.
I think it's worth introspecting on where you got this impression and what "many Twitter employees" means. It seems to me there are many powerful people who want you to have this impression but that doesn't mean it's true. Twitter had thousands of employees and I'd bet a strong majority of them are not ideologues in the way you imagine. Just people who work 9-5 and value job security.