I love Joe's writing. But I think he's got it wrong here.
Golf is different than any of the other sports he used as analogies. Losing a step finishes you in baseball, football, basketball... the sports in which hardly anyone stays competitive after 35 unless they're mutants or using PEDs.
Golf is much more mental. That's what Tiger has to get back. His mental edge. Everything else will fall in line if he gets his head right.