It seems more like "TeX-but-btw-it's-Scheme" than HTML. Interesting idea, hard to go wrong with S-expressions.

I believe the key difference with using a tool like Skribilo is that you have the full computational power of Scheme and can generate dynamic content. Other tools may be equal to just the writing aspect but this is Scheme turned inside out. Instead of a language creating content; this is content blocks interwoven with language output.

Adding a compilation step let’s you change the way things look easier in addition to having clearer semantics for the intent