Not sure if anyone read Skurski's piece in the BN on Sirianni but it explains that reaction very well
"You think about being in that moment of the Super Bowl, listening to the national anthem, how much that's going to mean,” he said. “It makes you think about all the hard work that you had to go through to get to the moment that you're in right now. It will be a good feeling. I'm not going to let myself get wrapped up in that feeling, because right after that, we're going to have a job to do. But I will let myself enjoy that moment for a second and enjoy that feeling, because there was a lot of hard work by a lot of people. Everyone is going to feel this way. There are a lot of people who helped me get to this spot that I'm in right now. It will be cool to listen to it and get to work.”
https://buffalonews.com/sports/bills/southwestern-graduate-eagles-coach-nick-sirianni-looks-to-add-to-his-familys-legacy-with-a/article_6c1fa9da-aa38-11ed-9dd3-0b9a7ebda449.html