If you're talking about Brady's play he was very good this year. Not his best year by a long shot, but he had a legit very good year. Which has never happened for a 42 year old QB. Let alone a 43 year old QB. He had a B+ borderline A- year. That is unprecedented.
As for how good the Bucs are as a whole, they have question marks. If they need to score 35+ points every week to win they will lose though. Brady probably can't be that consistent 4 games in a row anymore and the defenses won't be that bad. They will need their D to win at least one for them against a good offense. Can they do that? I don't know.