You have to put it in context, though. This was back in 1999. Plenty of people even today push for semantic HTML. HTML is said to represent a document, and documents have structure.
So I'm sure it wasn't all that uncommon to take it to mean that this structure was machine readable.
>One would never use HTML to transfer data between two systems
And yet it happened all the time back in the day, and there was even a big push to get into XML-izing html to xhtml and make it stricter and parsable and "semantic".