Yeah long term endurance hunting sounds like "bad hunting". You use up more calories, the prey expends more calories, you waste a whole day walking around in dangerous terrain and then you have to carry back the meat all the way back.

So even if their claims of greater female stamina bears out this would presumably only show that women can hunt better in certain worst case disciplines.

How does this make sense or am I missing something?

That's not my theory. That's the data.

One interpretation could be that women were constantly engaged in strenuous endurance activities and so through evolution built up tolerances against exhaustion that at least rivals if not exceeds that of men. And one historical activity that used a lot of stamina and took a lot of tolerance against fatigue was the way in which ancient humans hunted.

That's not what a theory is, it's a hypothesis at best, hope that helped.