My website is absolutely for me. Anyone who wants to visit is welcome though, I put it online for a reason. (You're also free to move along for that matter, that's up to you.)
The article states "A website isn't art". This product mindset fundamentally makes the web a boring place. I would personally welcome all websites that are art.
They're not talking about personal websites, they're talking about business ones.
One distinction the author didn't make was personal sites vs product / services sites. My personal site is for me, but the site for my SaaS app? That's for my customers.