I'm sure he'll try but now he has to negotiate, a greased S hook and roof of the feeder - it may slow him down if nothing else.Mice are excellent climbers, rope runners, acrobats, etc. As long as your feeder is out there, they'll find a way.
It was too easy before - the feeder was right next to a branch so all he had to do was step off on that onto the
tray. It will be interesting to see if he does it. I'll set my camera trap up.