No comment on how lower class women got 5 times the callback rate of lower class men? Almost exactly the rate at which upper class men outperformed upper class women? Is this reporting on the study biased in any way?
It's legitimate to ask why that difference was studied while the other one wasn't, but it's not legitimate to ask for speculation about the lower class difference when it wasn't specifically studied.
It looks like she is just slicing up the data to get the results she wants.