"the "deep" thinking associated with reading has always been a bit of an elitist idea" - precisely. This is all about massaging the categories such that consuming or producing a given type of media in a particular style is "good" and everything else is inadequate.

So if I read a bunch of tech manuals, I'm not a reader because it's not fine literature?

What if I read them as PDFs? What if I print them? Where's the line?

I think we ought to call it something other than simply "reading", because the author seems to be leveraging the dual-meaning of that word to make their point more strongly. But "consuming literature for enjoyment" doesn't come off quite as spicy as pretending that others that don't are illiterate.