This has already been shown to be incorrect. Men aren't dying out at all and the male chromosome isn't fragile.

In fact it's exactly as hearty as the female x.

So, why is this researcher saying this?

As some of you have guessed it is a combination of factors. A slight amount of data indicating a point and a lot of wishful thinking on her part as a woman.

This is VERY like the anti-environment people trying to desperately deny climate change. (Except the researcher in this case seemed to have better information to start with.)