I mean he did lead the league with 36 passing touchdowns that season against only 6 interceptions, and was one of the best passers in the league by basically any metric.

Just looking at total yards is a little silly when they passed far less often than any other team because they were the best rushing offense in history, and he sat out the 4th quarter of about 6-7 games that year (including the full week 17 game) because of how badly they were blowing out their opponents.

I don’t necessarily disagree with your overall point about longevity but to say he wasn’t a highly successful passer in those years is just not true.