Not to argue that gender bias doesn't exist. But this is not a good study case as he tainted his resume pretty badly from the start. Not being currently employed is a red flag to a lot of employers and gets you immediately discarded. And putting personal information, even if seemingly innocent, triggers the lawsuit avoidance mechanism at a lot of places and immediately gets you discarded.
I'm not sure you really read it closely. The ONLY thing that changed about his resume is the clarifying "Mr.". Whatever faults his resume might have were present before and after, yet the differences in its reception were dramatic.
