Yes, they clearly came with pitchforks ready, probably from feeling burned by GCP ("GCP has repeatedly declined to support Ruby Together in the work [...]").

It also doesn't seem clear that the code was forked at all, making this whole exercise pointless.

If anything it sounds like an unresolved grudge between him and Google, suddenly exploding when given the opportunity.

I'm getting the feeling that this is more of an attention seeking thing. The way that this seems to be so unnecessarily inflammatory and posted with a throwaway account. I'm sure that some people are going to see this non-profit org and make donations to spite Google.