I'm not secretly a Brit, I'm publicly a Brit
I'm also always chatting about British and European things in my Discord server.
In terms of the game, there are lots of references and details that a non-Brit wouldn't know about, and also things that happened in the Premier League over the last 20 years that are hard to pick up unless you are close to it. Most of the football talk, stories, moves etc. are grounded in that rich vein of history, with a little bit of Messi thrown in for good measure. I grew up watching football, played it until I was 18, and have supported Newcastle United since I was 11. Yeah, that's been quite the journey
So I do chuckle a lot when you get the occasional comment about how "the soccer is not realistic". Such a tell.
My proofreader does a very good job of helping translate my British English into American English, to help it work better for an international audience. I could have done the whole thing natively but then my niche game would have been even smaller than it is... probably!