I have no idea how the middle section of this post is relevant to the rest of it. It just seems like the author needed to flesh out another rant or justify a choice no one questioned them on and decided to find any reason to diss the web. An error in the W3 validator is not really an 'error', especially considering the type of errors that are included in those 600 odd (Most of them are about missing spaces).

EDIT: Just seen the date on the article, likely the hundreds and hundreds of errors at the time are gone now, seeing as there's only like 50 showing now