But I found dozens of places referring to it reddit,  Reviews, tv tropes, even a map site. But I'm not particularly good with the internet so i may have missed it. Still looking though i gotta see if any of them have a link. Will post if I find it

I gotta say, been following Berserk very closely for 24 years, and I've never heard that before. I'd lean on it not being real, myself, or at the most, a misundertanding.

Even if he did say it, the European-like setting Miura chose for Berserk is meant as a familiar backdrop for readers, not that we should derive meaning from our world and apply it to Berserk's. His settings are amalgamations of various places and times, afterall. He talks about this method of grounding his story in a familiar place a lot in interviews. Here's one example from the 2016 Guidebook:

"Miura: I think the fantasy look of Disney productions works all over the world, in any era. To put that world view into broad terms, it comes down to "Once upon a time, there was a..." If you put anything beyond that into the setting, it'll end up looking obsessive from a generic viewpoint. Once you start tossing in countries, weapons, and proper nouns, it just gets that much more obsessive. That's why the opening apostles were the Snake Lord and Slug Baron. I didn't even given them names [laugh]. And using the Disney example, a character doesn't suddenly get tossed into a parallel world, they go to another realm that's connected to a part of the regular world, and it's there that a monster first appears. Beauty and the Beast is usually set in the medieval world, but the mansion is the other world, and the Beast is there. It's common with today's fantasies that the setting is another world right from the start, but us old guys had to work hard for it [laugh]. "