That's how the producer of Sunday Night Football explained it. Last week, Al told the audience he would be taking a "bye week." In his place this weekend was Mike Tirico. Mike had done play by play for Monday Night Football, so he knows the drill. But apparently Al Michaels is winding down is career. At age 75, that's understandable.
https://saintswire.usatoday.com/202...otball-saints-packers-mike-tirico-nbc-sports/
https://saintswire.usatoday.com/202...otball-saints-packers-mike-tirico-nbc-sports/