Many more black males are in prison or unable to vote due to past felony convictions than their female counterparts. So even if the same percentage of qualified black males voted as black females, the female vote would surpass the male vote.
But is this also true for white, asian, and hispanic populations?
If pretty much all black voters will be voting Democrat then it doesn't really matter to the GOP whether black males vote more or less than black females.
What will really matter is whether there will be enough white male voters to counteract any sex-based voting nonsense.
That's important, yes. But even among white voters, women have been outnumbering men for quite a while. I think that started about 1990, though I'm not sure. Traditionally, when women first began to vote, it didn't really have much effect on the overall voting percentages, because there was no significant "gender gap." The "gender gap" really began when women received more government assistance, statistically, than men did.
I so happens, BTW, that although all blacks as a group vote around 90% 'Rat for president, there is a "gender gap" in the black vote as well.