I was wondering the same. Elsie says Bernard has been here "forever," so who knows when all that chatter is happening.

Yes, I caught that too. I brought the setting up to imply that Bernard has likely been speaking to Delores with Ford's complete knowledge and potentially even as his agent.

The room in which Bernard has been having secret chats with Delores is the same as the lab under the cottage. Or at least an identical layout.