But he was harmed: he was allegedly fired for reporting religious discrimination.
He may not have been harmed by the cult members, but he was (again, allegedly) harmed by the culture created by this cult. "I learned of someone being discriminated due to their religious beliefs (or lack of), I reported it and the company fired me" makes a good case for the company supporting and/or engaging in religious discrimination.
I'm not saying the author will win - it is entirely possible, like you say, that he was fired for being disruptive or other hundred valid reasons. But I do think the author raises at least a good initial argument.
>But he was harmed: he was allegedly fired for reporting religious discrimination.
He was allegedly harmed. If, as the person you are replying to speculates, he was freaking out and being a bad employee after discovering the affiliation of his coworkers, then potentially that's a righteous firing and he wasn't harmed in a legal sense. If as he alleges, he was fired for having valid concerns, then yes, harm in a legal sense.
"I was fired from my team there in February of 2021 because I raised alarm about a cult within Google, a group called the Fellowship of Friends. "
Sounds to me like he freaked out because he was working with weirdos, wanted 'someone to do something about it', and then wouldn't let it go.