Yes, yes! I noticed that, too! And honestly, at the end, he's basically telling the humans there that they either need to pay rent to the robots or be killed. He'd just been saying that humans would be extinct if they were killed, so why is he now no longer concerned that the humans would be killed? Wouldn't you think that he'd be pleading with the robots to not kill the humans?

And by the way, if the robots can build anything for their planet, what use would they have for money?