Not necessarily. The acceptable range is 12.5 to 13.5
If the Colts had balls closer to 13.5 and they lost .5 pound of pressure, then a perfectly legal Pats ball at 12.5, would then be under.
Pats footballs were 2 psi under. That wasn’t a natural drop, proven by the fact that the Colts footballs did not drop to below legal limit, which they would have even at 13.5. It’s all smoke blowing by Belichick - deny deny deny and stall.
The Patriots footballs were a full 2# underinflated....the very moment that their QB touched those balls...he knew it..He probably didn't deflate them...but he KNEW that they were soft PERIOD