This comment would make sense if he hadn't stated that the PR was politically biased but had instead said that it was unnecessary or that it would be inconsistent with the vast majority of the documentation. I'm just reading what he said. He claimed it was a PR based on politics, not language norms or historical norms. Only certain kinds of conservatives view gender-inclusive language as a political issue.
I appreciate that you don't want to see this person as a hateful bigot and I don't think he is either. Most people I've encountered that share the same reaction as him have basically been tainted by conservative influences, like media or parents, but they don't have any real hate for trans people in their hearts. They've associated the idea of gender-inclusivity as being political and moved on with their lives, accepting the framing and narratives around the topic.
There are some people who both start and end every gun debate with the "good guy with a gun" argument. Nothing gets through the impenetrable logic of "it makes sense to me".