NYC PS is anti-something?

Please pardon the repetition, but I figured I'd share here, too.
The kids' school has a "kindness quote" (I think it's "of the week" but am not sure). It's a quote that includes the power of kindness and a picture of the person quoted. Right now it's Anne Frank, and she is cited as "Author, The Diary of a Young Girl."
Now, here's a good reason to be a stickler for accuracy. Maybe she should be called "diarist." Or maybe she should have not titular appellation at all.
See, my point is that "author" implies that the whole thing is made up. And would that make the public school a holocaust denier?
Maybe the whole point of the kindness quote has passed me by.