I'm surprised it caused that much of a reaction, if that indeed was the reason (which I am not sure it is). I mean, everybody knows by now these models are prone to fibbing and would invent factoids and references out of thin air. So, Google model is as good/bad as all others, and also somebody wasn't diligent enough to fact-check their own ad (which can, I guess, be taken as a sign of organizational decline but pretty much any organization of Google's side has the same problems).