The author of the post is known for some pretty fancy CSS wizardry. I’m guessing AI is not great on some very specific, advanced CSS use cases where there isn’t much prior work. But again this is an edge case compared to what the vast majority of us are doing
But even then, what is a fancy CSS wizardry that AI couldn't do for instance, but would be trivial for the author?
Or is it that AI is not as creative?