It's a short-hand for the treatment of the subject being pretty shallow and non-descript, which seems to apply to this article exactly. I read this and didn't learn anything.
Of course I didn't write the original comment and there's something to say for flag-and-move-on or whatever, and other people did enjoy it. I'm just saying I understand the impulse to short-circuit the entire tedious conversation!
I'd disagree with this pretty strongly since there are many examples of content marketing that are also very useful pieces of content.