Everyone I've spoken to about that phenomena agrees that it happens to them. Whatever we are reading at the time, it reformats our language processing to change writing and, I found, even the way i speak. I suspect that individuals consistently exposed to and reading LLM output will be talking like them soon.
When I was at a newish job (like 2 months?) my manager said I "speak more in a Brittish manner" than others. At the time I had been binge watching Top Gear for a couple weeks, so I guess I picked it up enough to be noticeable.
Of course I told him I'd been binging TG and we discovered a mutual love of cars. I think the Britishisms left my speech eventually, but that's not something I can figure out for myself!
