Women ask for raises as often as men, but are less likely to get them

As might be guessed, lots of different factors do seem to influence the rate of “asking.” Older workers do so more often. Long-tenured employees do so more often. Full-timers do so more often. Perhaps unsurprisingly, all part-timers, whether male or female, tend both to “ask,” and to get, less often.

Is it possible that the conclusion is heavily influenced by this factor? Are there significantly more women in part-time positions?

We did, however, find intriguing differences across age groups. The younger women in the labor market appear statistically indistinguishable — even in “getting” — from the younger men. Hence it could be that negotiating behavior through the years has begun to change.

When there is no explicit statement that wages are negotiable, females are more likely than males to signal their willingness to work for a lower wage rate.

I'm confused, are they countering their own conclusion here (in regards to the rate of "getting" being wholly independent from the actions of the women)? Or am I reading too much into the claim here?