I don't see how using Apache, with what I guess are the default settings, has any bearing on remarks about MySQL.

The OP is not trying to be "a performance authority about web technology", in fact the article's main focus in not on performance, but on peculiarities in the RDBMS engine that force the developers to constantly seek workarounds and be very careful about silent (and unexpected) behavior.

There is no "web technologies" in the article, the term "web" is found only once (!) in the whole text.

And so you assume that the author of the article doesn't know how to optimize his or her blog, ignoring the possibility that he or she does, but didn't do it for intervening reasons.

Still has no bearing on the veracity of statements made in the article.