Whenever I see stuff about what readers "owe" authors, I always think of Daniel Pennac's "Les 10 droits du lecteur" from
Comme un roman (The 10 Rights of the Reader), which you can find in handy illustrated form
here (pdf poster promo for the English translation) and
here (original French in blogpost with commentary).
In short, between "the right not to read", "the right to skip", "the right not to finish a book", "the right to read anything", and "the right to be quiet", readers don't owe authors anything, not even in terms of actually reading the work presented, any more than the authors themselves owe the readers anything, in terms of actually presenting decently written work.
Sure, it's nice if the book has a great story/well-researched recounting of facts and is properly edited and all, and it's nice if someone who enjoyed it talks it up to their friends and family and the world wide web at large so that they in turn may discover it for themselves, and the author gets some kind of ensuing financial support from the extra publicity hopefully leading to additional sales.
But that's an extra to the reader/author relationship, not the core foundation of it.
Nothing is ever owed on either side, not even a full read, not even direct payment for the read (so long as the book is obtained in a legal fashion if available to be distributed as such, allowing for out-of-printedness, geo-restrictions, second-hand sales, etc.).
I myself have in the past and will in the future post about books I've read that I liked and recommend others to try, and/or point out discount titles from authors/publishers that have given away freebies, but I do it on my own time for my own reasons, not because of any obligation to boost the author/publisher in return for their having put their work out there, even on what I'd consider generous terms.
As a reader, I have the right to read or not to read as I see fit, and to be as loud or as quiet about what I've read as I want, and not have any of that dictated at the author's behest for their benefit if I don't feel like it.
And really, the more someone goes on about how I should, the less I'm inclined to feel like I want to.
TL;DR: I agree with the article linked in the OP. Dear Author, if my time isn't enough for you, then too bad. You're probably not getting any more of it.