I'm not disagreeing with you, but "website development" is a very broad category. For example, if you definitely need a website with server-side logic and database connections, yes, that's where PHP will shine. However, if you need a more or less static website for your restaurant or portfolio, is it really as straightforward to say "PHP is for website development, write your website in PHP"?
I want to be very clear that I'm differentiating between use cases here, but for something like a technical documentation website, a status page or something similar that does not require server-side logic and databases, I would much prefer using Hugo or some other type of static site generator, and not because PHP is bad but because we're still talking about "website development" but just not necessarily the kind of website that PHP was made to build.
That being said, there are of course static site generators in PHP as well (and probably every other language out there), but Hugo has a special place in my heart just because of the speed of it.