Artficial gravity instantaneous with atmospheric pressure?
What a poorly thought out system.
I'm ok with unexplained artificial gravity (although I wish many sci-fi movies would at least have a try at making something up), but the instant and sudden return of gravity when the airlock is pressurised seems a very dangerous and inconvenient procedure.
At least have it come on gently so the spacewalker can orient themselves and have a nice soft landing before it immediately jumps to one gee, potentially dumping him on his head and damaging equipment.
...then whoa, differences...