No. Not stocking a book because it's physically impossible to stock all books in the world is not the same as banning it.
The ALA's statement[1] is clear, and IMO common-sense: proscribing or removing content for doctrinal reasons is the problem.
The concrete "book bans" I've heard about have been that Maus is no longer required reading in 8th grade, or that explicit sex pictures are banned from middle school libraries. Neither seem terrible to me.
What are the most egregious bans I might actually be upset by?
That being said: I, for one, think that 8th graders should have Maus accessible to them; it's a difficult book substantively and in terms of presentation, but I don't think reading it is going to "damage" any 8th grader. "Required" is besides the point.
My point was that when Maus stopped being part of required reading in one school district, that was reported as a "book ban", which is very misleading.
So now I'm suspicious of other reported "book bans" until I've heard the details.