It wasn’t a commercial. Instead of having a pregame president interview (the historic precedent, but Biden declined as he is no longer mentally fit to be interviewed), he just posted a video about shrinkflation on X / Twitter.
Also, reacting in the same manner as the liberals on this forum that take everything Trump says literally, “ZOMG BIDEN ADMITTED TO RIGGING THE SUPER BOWL!!!”
https://twitter.com/JoeBiden/status/1756888470599967000