I wonder this same thing about my company. The only rational theory I’ve heard - which is completely unconfirmed - is that they aren’t willing to sell the building because it’s still needed for the IT team and a few other purposes, but need a certain occupancy level to not be penalized on their taxes.
So what does he want to be called? Just a rat? But - there are actual rats, which are already called rats. Unless those don’t exist in this universe, “ratman” seems like a pretty reasonable term. He has both rat and humanoid features.