Keltham notes down this exact response to his unspoken question as a slight bit of evidence that they're reading his mind or talking to devils smart enough to model it eerily perfectly, but it's only slight evidence; if Keltham can think of it, so can they, Keltham supposes. There hasn't been very much other evidence of his hosts reading his mind, not counting Lrilatha seeming to know exactly how to talk to him, and Lrilatha is a more plausible big special case.
"I would really have expected more for there to be a systematic compendium of entities that have clerics, if there's only a few hundred of them, and especially those represented at the Worldwound..." Keltham says. "Any simple way of getting a count on all the Lawful Neutral gods with clerics there, or even asking them all for a one-paragraph summary of what their gods are about?" It is really bizarre to Keltham that info like this has not already been collected.