I doubt they’ll negate the yards on that play.
After breaking the single season TD pass record, Manning modestly considered it “temporary” because it will be broken again by someone.
I’m pretty sure however that all that matters to Peyton Manning at this point is to win Super Bowls.
I should think so. He's had individual records, seen them broken, and taken them back again (at least the single-season TD one, I'm sure thee are likely others) after a supposedly career-ending injury.
He really has nothing left to prove to anybody at an individual level - the only thing left is winning more titles.