Ever since the departure of Jared Paul Stern (the disgraced-then-undisgraced “Page Six” writer who also handled book reviews), the Post has been running light on literary coverage. Now, we hear, the tabloid has given in completely, and editors have decided to stop running book reviews. Their last, according to their Website, was printed in late July. This, of course, will cut off an easy source of income for a lot of New York’s freelance writers and drinkers. But more importantly, it shows evidence of a fact we’ve questioned in the past: The Post does know its readership after all.