How exactly is removing a book from a school's "supplemental reading list for high-school sophomores" considered a ban?
If the school doesn't want to choose to recommend the book as part of their curriculum, what's wrong with that? Ceasing to endorse a book is not the same as banning it. The school isn't stopping kids from reading it, and they aren't prohibiting it from being on the grounds - that would be an actual ban. All they've done is stop recommending it, which is entirely their prerogative.
Seriously, talk about your abusively worded journalism! Fortunately, of the three cited articles, only the Boise Weekly actually uses the word "ban" - a mealy-mouthed usage in the form of the headline: "Banned from Meridian Curriculum, Controversial Book Lands in More Hands".
Whomever came up with that weasely little tidbit must feel awfully clever, managing to insinuate an actual book banning, but in actuality literally only meaning that the book has been removed from the curriculum. Looks like it worked, because it appears to have succeeded in confusing and misguiding Mr. Doctorow.
Personally, I have no opinion on the book in question or on its contents. I have no opinion on the school's rationale for removing it from their curriculum. It's none of my business, because the book is not actually being censored and the children are still perfectly allowed to read the book at the school - it's readily available in their library, for crying out loud.