Whichever way people will want to slice and dice the numbers, the irrefutable fact is that women are the victims in a vast majority (by a very very large margin) of sexual assaults. Intended or not, the action and suffering caused is the same. People that try to make it sound like a non-issue should probably be made to mentally live through it to understand.
edit: When prominent people in open source communities make such claims in public, it affects the entire community. It makes women feel vulnerable and unwelcome & might convey the wrong ideas to impressionable young minds.