Why yes, it appears he is:
Bishops will do that, from time to time—these days, it’s not an uncommon practice at diaconate ordinations—as a sign of the bishop’s connection to the order of deacon.
Anyway: you see the above image, or variations of it, very often. In fact, a version of it hangs in the lobby of the building where I work, in a city where St. Patrick’s Day is almost as important and sacred an occasion as Christmas.
Happy St. Patrick’s Day!