Did you see his update below that paragraph? He admits that he had to update everything, and his pages are not currently a time capsule. It basically negates his entire message.
I think the moral of the story here is that if you're going to be advocating for HTML over a SSG, then perhaps it would make sense to invest a bit of time on a styleguide page, or take a bit more effort to leverage default styles (in the style of http://motherfuckingwebsite.com/), or just commit to inline styles to lock down the individualistic look of each page (if that's what they want). Being wishy-washy about style management over time is not going to age well.