He's the bishop. Following the Pope's footsteps, slumming is part of his job. What?
I think this is his Cathedral - might be wrong.
Oh wait - you mean Fr. Z?
No, I mean he would go whatever parish and say Mass in whichever form, facing either direction wearing a chasuble of some kind.
Please comment with charity and avoid ad hominem attacks. I exercise the right to delete comments I find inappropriate. If you use your real name there is a better chance your comment will stay put.