Where on Earth did you get that idea? Every library I've ever been to has offered all kinds of events geared to "socializing," from Group Crochet, to Book discussions, to AA. Not to mention how common it is for libraries to offer "teen spaces" where kids are free to hang out, work on homework together, etc.
It wasn't worded in the clearest way but I believe the author is talking about AA in the context of Ivy leagues specifically, and that AA at those institutions has done nothing to offset the % of (mostly white) elites who gain access through athletics/legacy admissions, etc. How this benefits those same elites is that by having universities push AA as a part of their public image (i.e., we're doing our part in fixing the damage done by our slave-owning founder) it draws attention away from the privileged forms of admission that actually impact who attends Ivy Leagues. Basically AA at those schools is a smokescreen that does very little while allowing those schools to pretend like they're helping fight for anti-racism, social equity, and so on.