Brady's stat line most resembles his line from 2019, that last year in NE. Similar yards per attempt, yards per game, QBR. This year he is throwing fewer TDs (career low 2.7%) but freakishly fewer INTs (only one on the year so far for a career-best percentage of 0.3%).
One could have looked at the 2019 line and asked the same question ("is this the end?"), but subsequent events showed that it obviously wasn't. And this looks like another 2019 type year for him.
However, he is 45 now. If this is another 2019, does he have it in him at this point to regroup and give it another shot at 46?