I agree Olenna, it has been baby no 2 (or 2 and 3) when the wheels come off for a lot of my friends too. I don't think they intentionally married sexist men though - I think what happens is when men are overstretched and overtired themselves really deep down social conditioning comes out, which isn't processed through their normal, thinking minds. And that is sexist. Given how prevalent and deep rooted this conditioning is in our culture, it is a rare man who DOESNT react in that way.
It has been deeply upsetting for friends to encounter that in their own marriage. And for me - I fought it for YEARS. Although DH would say he valued my career as much as his own, he wasn't prepared to change his working schedule at all to enable me to follow mine because he thought that would reflect badly on him, and there was always some big emergency which needed to be attended to. The penny dropped eventually but my word, it took me digging my heels and then some to get there and I never in a million years expected that I would have to do that.
But sexism is only one factor. I think the researcher is right, the other, structural issue is the changing nature of work, where a 9-5 has become more like an 8-8 (with long or unpredictable trips away, a commute and always being available on a smartphone). It just doesnt fit with small people.