Is "Semantic CSS" just... CSS? There's no such thing as "Semantic CSS". There is Semantic HTML. I suppose there is CSS for Semantic HTML.

I've read the article and can't figure out if this is comparing the CSS framework Semantic UI to Tailwind?

If we're comparing CSS to a CSS framework, it seems fairly obvious to me that it's going to be bigger in size, and slower to load, and that the amount of code required to be generic (rather than totally specific) would be larger too.