While that rule would help passers like Peyton Manning, it also helped Brady, so I don’t see how that was anti-Pats. Again, if anything, it was anti-Steelers as much as anti-Pats. And both the Carson rule and Brady rule helped the Pats.
It was anti-Pats because it was explicitly put in place because Bill Polian was tired of his Colts losing to the Patriots, and to combat what he thought was their defense of the time (2004). That part really isn’t debatable.
It wasn’t until 2007 that the Patriots began to make use of the change.
As for the roughing the passer, Brady is consistently in the bottom third of the league in receiving roughing the passer penalties.