Very unprofessional of him...
Escorts and folks on other activities dealing with other's lives and time should have their shit together.
There was a Belgian escort who would NOT tell his clients the room number where he was staying... In HIS case it was nothing but a control issue and a taste of things to come while hiring him.
I ask if I need a key to come up, even if the guys says he has to meet me downstairs, I always say what if I tailgate, what's your room number. I simply need go know where am I going to.
One more thing I don't know of any escort who would randomly go to a hotel room without knowing the room number in case he can tailgate.
Why? Yinz love going upstairs and folks knowing you're paying for sex?