Not sure if it's too soon to joke about this, but I find it funny that "I like Jupyter notebooks" was such a controversial opinion at JupyterCon.
(Yeah I know it was actually the mask advocacy and not the talk itself.)
Is that what actually caused the complaints?
Given that the complainers were anonymous (thanks to the CoC process), we'll never know. But it seems like a reasonable guess.
The question was: can we find out if hidden political vendettas against OP were the cause of complaints? You're implying that, yes, we can find out, because the complainers provided a bullet point list. If the complainers had hidden political vendettas against OP, do you actually think they would have listed them in the bullet points?
I recommend watching Stephen Colbert's or Trevor Noah's talk show skits to gain an idea of why a pro-mask position is controversial in the states.