The split is 94.3% vs 5.7%.Just because the world is 50/50 men and women, does not mean everything is life is split 50/50.
That's like saying if 30% of the world is in the 25-40 year old bracket, 30% of all jobs should have people aged 25-40 no matter what job it is.
Out of all the women working there only 4 women got the promotion offer. Out of all the men that is working there, almost 70 were offered the promotion.
I dont know how you can spin this disparity.