Oculus Quest 2 controllers have a thumb rest sensor just like the Oculus Rift CV1. Those are very useful for Natural Locomotion since it allows us to use as walking activator without doing any remap to games. However the current Oculus Link software works exactly the same as with Oculus Quest 1 and it doesn't send this information to the PC, at least not yet. For now Natural Locomotion works exactly like the Quest 1: It defaults to joystick touch but it has the "virtual thumb rest" option (which is not used by default because it was a bit too unreliable).
If a future update to Oculus Link sends this sensor we'll detect it as classic Oculus Touch controllers to be able to use this feature.