The author should have called this "Isekai izakaya..." instead of "Isekai café...", if they despise and/or lack any knowledge of european cuisine so much. The arrogance of claiming an european-style country (even medieval) wouldn't know how to make proper BREAD of all thing. The Portugueses introduced bread, Europe's staple food, to Japan in the 16th century, not the other way around.
If you've ever watched Uncle Roger reacting to Jamie Oliver's making "curry" without chili, "ramen" with soba noodles or "egg fried rice" with jam, that's how I felt reading the first chapters.