The no-true-scotsman fallacy implies a shifting or pedantically narrow definition. That's not applicable here. Paleo fans are very clear that they're trying to

The no-true-scotsman fallacy implies a shifting or pedantically narrow definition. That's not applicable here. Paleo fans are very clear that they're trying to emulate pre-agricultural diets. That's the sine qua non of the Paleo fad. So it's totally legitimate that they would object to evidence about agricultural societies.