Don’t worry, you don’t need to attack them – they do a great job of making themselves look ridiculous with their ignorant conversation. I would be so embarrassed if I had suggested that in public then subsequently discovered that the header doesn’t mean that at all.
People keep trying to systematize things for the tools they keep saying don't need systemization. No idea why you can't just put the documentation programming language context in the URL. "/docs/typescript/...", "/docs/python/..." etc.
I don't think the agents are struggling with the idea that different URLs have different responses, and that checking the sitemap is a good idea.
Tangential: A rare en–dash user out in the wild!