Yep, it's got a rubbery grippy surface to follow the plane. As the plane goes down, the wheel will creep up a little bit so the jet bridge height will go down a tiny bit too.
Fun fact: they also have an alarm if something funky happens, like if someone pulls on the unit when it's in use.
Sounds like bribery to me. Which has a law and a cause for impeachment in the Constitution.