I think from seeing articles like this a few times, that there's a lack of definition from people as what counts as "real reading" and about what materials "count as real reading"
(since I think probably people are reading these days more than ever - it just may be on forums like HN, social media, and AI output, etc.)
so if you just define that specifically then we could just promote it on social media, people reading these specific things, and then "boom" more people are "really reading"
(I presume people want to see more people reading "Great Books of Classic Literature" which is probably a great goal, things like Chaucer's "Canterbury Tales" or Dante's "The Divine Comedy", etc.)
I think most people would consider it something published alright, as other definitions start to become a bit absurd (e.g. reading the menu at a restaurant or the match day programme probably aren't what people consider as 'reading for pleasure').
Outside of that, I don't think we should gatekeep it too much though - the biggest benefits come from reading anything at all.
The study focuses on books (and comics, but that only bumped it up by a couple of percent).
I've seen many of these types of articles, and usually they are taking about long form reading, meaning books.