His basic argument holds truth though, there are pornographic elements in most created works, i.e. elements created strictly to gratify or comfort the reader in some specific way. This is why we instinctually pigeonhole and look down upon genre fiction writers, because their primary task is to comfort the reader, not to challenge or engage in a dialogue with him. Let's break down the different genre's and see what be…
By "comfort" if you mean "entertain," then yes, all (not just genre) fiction writers should tell a good story if you want a wide audience.
The attempt to boil down entire genres to a single fetish (belief system) gratification is extremely dismissive. Sure, you can find examples of formulaic, bad prose in genres, just as you can find excellent writing. A number of authors try to get their work classified away from science-fiction or another genre just because of this stigma.
The linked article claims Ender's game is "porn" but his definition of porn is not like mine. Porn has little narrative structure. There's almost no story. There's no 3D characterization or character development. There's no conflict.
If the definition of porn becomes any work with elements that gratify a reader's particular needs, then which successful works aren't porn? The most erudite, soul-searching work gratifies a philosophical fetish.
And if your definition of value is tied to creating insight or facilitating discussion, then that's a clear difference between a work like Ender's Game and the serial romance books your mom reads.