Poor journalism, yet again. Factor implies causal link. It's just a correlation in this case.
I view it as the study went looking for X, and to it's surprise didn't see X, but happened to see statistical significance in Y. However the study did not have the scope to determine why Y occurred. I think the most likely thing that changed over time is Z: the first wave(s) of feminism began to liberate females from the traditional limitations of roles in society. However the true from of feminism is a recognition a…
Liberation from what? The "burden to provide" comes with a lot of benefits, and I know I wouldn't trade them all for "liberated" homesteading.
In many ways, what you call "the true form of feminism" for men is just a long way down, a fall from grace, in the same way as Enlightenment was for aristocrats. It's not surprising that most turkeys refuse to vote for Christmas.