Bill Belichick confirms kicking balls were underinflated vs. Chiefs: Patriots 'don't have anything to do with it'
Deflated footballs are a sensitive subject in New England.
sports.yahoo.com
Well, if anyone should know about under-inflated balls, Billicheat should know. He and Brady cheated for over twenty years when they were together. All you have to do is Google Deflategate and you will see just one of the examples of their cheating. Now that Bill and Tom are apart, the Patriot machine is in a mess. But they did cheat well together for years.
Deflategate - Wikipedia
en.wikipedia.org