They praise the settlement’s effects in making accessible versions of books available. I’d note that most of the disability-specific benefits of the settlement are merely fixes to broken features of copyright law, which is absurdly stingy when it comes to the rights of the disabled. Still, getting the Authors Guild (whom you may remember from their Kindle text-to-speech snit fit) to go along with these expanded access provisions is no mean feat on Google’s part.
Ironically, I’ve been unable to find an accessible version of the AAPD’s letter to the court.