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The 5KB is trivial. They don't mention how much was actually removed. Maybe 200KB? Who knows

It has also vastly simplified the maintenance of the website.

In fairness, the page loads two enormous fonts. Lots of blogs just use system fonts, so the advice is generally useful if you're trying to reduce your own site size. The total payload without the fonts are around 12kb, so reducing the CSS to 5kb is a fairly big deal. Without the fonts, the entire site could be delivered in the first TCP packet.

It'd be even more irrelevant if the site didn't do "public,max-age=0,must-revalidate" on the CSS file.