He clarified that he means "textbook-free, not free textbooks." Hence #OpenTextbooks (#OER) won't satisfy him. But he encourages OER as if they would.
Faculty criticized him for “encouraging [them] to invest significant time” in creating “#OpenAccess materials" (OER) rather than using or improving materials from publishers.
During my time as a teacher in the mid noughties I never had access to OER material and the commercial resources required lots of extra labour to use them for lessons.
I had assumed it was just how teaching resources work. Is that me or a common experience?