I don't think so, there's lots of reasons that would be a stupid idea for Facebook. But there's clearly something shady going on, and Facebook is being dicks to them in other ways, so they're out. That's the subtext.
Does me pointing out the barely shrouded subtext mean that I believe what they are saying? Of course not. It's just as likely, it seems, that their test is simply flawed (as others said, let's see the technical honey trap), that it's some other technical fault, etc. I highly doubt, just on intuition, that Facebook is running such broken bots: Come on, they'd do a better job than make something so easily detected.
That to me sounds like FB is aware of the issue and isn't interested in discussing it. That's the subtext imo.
My own suspicion would be because someone is gaming their ads and they haven't been able to prevent it as of yet, and not because they themselves are gaming the numbers. No doubt they believe that discussing it is tacit admission that they haven't been able to prevent it, which is bad for business.
And it doesn't matter who it is, because they're leaving for a different reason: Facebook never returns their calls unless it's with an offer of extortion.