Basically instead of boring old football, we’re going to get boring old football with the Simpsons superimposed on top of it.

A similar thing happened during the last Super Bowl with SpongeBob, https://www.avclub.com/spongebob-squarepants-super-bowl-broadcast-nickelodeon-1851248912

I imagine this is a test run (also similar to SpongeBob) and we’ll get a similar alternative broadcast during the Super Bowl.