A deflated football is easier to grip which means it’s less likely to be fumbled, and more likely to be caught but doesn’t help in a blowout. Just like election fraud doesn’t help in a blowout election but makes a real difference in a close election. NE has been caught cheating in the past and that’s what they do. I believe they’ve probably been using deflated balls for years.
When a football is inflated in a room of 1 temp and then taken to a different temp the PSI of the ball will vary.
If the ball is wet the PSI and weight will change.
The following video explains how the ball reacted during the Colts Pats game. :
https://www.youtube.com/watch?v=CxsXFX3tDpg