Re: Maybe
PDF/A forbids embedding JavaScript.
It's mostly JavaScript which turns the browser into CPU-thrashing data-slurping application runner. Turn off JavaScript and watch most websites degrade into a mess rather than fall gracefully back to an accessible page containing static data and then the browser using 0% CPU waiting for a click event... because HTML's been hijacked to provide a template for the JavaScript to stick content in and mess around with - this was not HTML's original intent but it's been pushed into that job.
So while he complains about HTML, it's really the newer parts of HTML and JavaScript which are the guilty parties.