The biggest thing that irritates me from this is the implication that anybody is arguing for "historical accuracy" to medieval Europe in a setting that has dragons and goblins that shoot lightning from their fingertips. If, for whatever weird reason, the DM doesn't want potatoes to exist that's okay, but you're not waiting for the Columbian exchange to bring them over from the Americas because the Americas don't exist here. If you have a player character that's a shape shifting sentient blob who casts illusions and is on a quest to seduce every milliner they can find then a plain tasting sausage made from fine ground questionable cuts of meat shouldn't be seen as a stretch.

Additionally, as someone who majored in History in college, I can assure you that most people insisting on "historical accuracy" on any one or two things they learned from a tweet or a tiktok about are almost definitely getting fifteen other things wrong in any given session.

My take:

It's not even set on Earth in the first place, so "historical accuracy" is a non-starter. This world can be whatever you want it to be.

One time another player and who both speak spanish were playing tieflings and decided that tieflings are native to mexico so we'd make jokes about our native foods that no one knows about bc they are "from mexico". Anytime we spoke infernal in game we'd just speak spanish irl bc the other players couldn't understand it. Super silly

Why wouldn't your setting have potatoes? Does your setting have Peru in it? No, no Peru? Gee, then it sure sounds to me like you get to decide where potatoes come from in your setting; they don't have to be a "new world" food if you world doesn't have or has a different "new world."

Potatoes? What are potatoes?

I still get teased about a player claiming bears can't go backwards and I just incorporated it into the battle. It was a one-shot for new players (and new GM). It was fun. Another player got pissed on to put out a fire. Fun times. "Anything goes" can be fun, don't overthink it sometimes

You think that bad, wait till you hear about wizards selling spells to America to get guns.

Meanwhile, Bob's Bison Burgers has been trading in Pavis since the early 1980s.

Can you explain how potatoes led to hotdigs?