This is exactly censorship via omission. What could possibly be the intent here other than to discourage use of these phrases across wide swaths of the population.

>It's simply not autocompleted.

Inaccurate. According to swipeblocked.com it is blocked with both swiping and autocomplete.

We're not censoring the book. It's simply not on the shelves. You can ask for it by name if you like. You have to spell it out exactly though, or else the librarian will deny any knowledge of it.