The article you linked goes to great lengths about Orwell's alleged scotophobia. I don't see how particularly hating scotts supports "intentially treating those cultures as identical". If that was true, then Orwell would equally hate all scots and englishmen.

Also, what's the downside of treating different cultures identical, aside from potentially offending people? As opposed to other kind of racism, where other people are treated as lesser subhumans that ultimately led to slavery. Why are both casually referred to racism when the other has more far-reaching consequences.

If he was an entirely rational being I would agree, but he clearly wasn't and he did hold both views that Scottish identity isn't worth anything and Scots are essentially identical to the English.

Let's be serious, I'm not saying Orwell would be out enslaving Scots given the chance, but saying Scottish culture IS English culture is intentionally erasing a culture and is a racist statement, not unlike the common view that all of Africa is culturally homogenous.