No he's not. This isn't an argument for more historicity, this is an argument for flavour. The Devs have clearly flavoured civs based on their real world historicity, and this chap does not have a desire to pretend they are not something the Devs designed them to be.
That doesn't means he's arguing for a historical simulator. It means the Devs have not got the historical flavouring right for him. His whole argument over multiple posts has been about wanting to create an alternate history by taking a native American empire into the modern age and how the European inspired America doesn't scratch that itch, the information is all there for you.
Nobody in this thread has made any indication they want to simulate history, and I'm confident 99.99% of civ players don't want a historical simulator, and instead want to create their own historical alternate reality. We're debating the bounds of what "their own historical alternate reality" looks like, and it is dismissive to conflate a legitimate, and obvious by this point months into the debate, position with a position arguing for the game to be something we all know it's not. He is arguing for the game to be what it has previously been, not what it has never been, and that is abundantly clear. This is a lazy, dismissive and at this point verging on bad faith counter argument you are putting forward.
There's nothing added to discussion by making incorrect assumptions about someone's point of view you disagree with. Just don't engage if you don't like it, but don't put words in people's mouths, especially when this argument has been gone round so many times and you should know better.