Di quella pira is a show off aria for tenor in Il Trovatore and is one of my favorite Verdi's arias. In today's MET performance, that I'm listening on the radio, Alvarez did sung just half of the aria, in a lower key and avoiding singing many phrases at the end. This is usual today and I don't know why. Perhaps it was better to sing it right, avoiding the final high C (B in this case) that Verdi never wrote.
This is just my opinion. Alvarez got many applause in the MET.