I'm just sharing my opinion. I don't mean it to be a grand condemnation or a big deal. I hardly feel entitled. When otherwise good organizations misbehave I feel free to point it out. I don't complain about getting downvoted when people disagree.
The fact is that this stat is provably misleading. People are understanding, and reporting it as, "25% of YC founders are female" when the reality is very different. YC knows about this and yet continues to use it. I think it's an understandable and small lapse in ethics predictably justified by some weak rationalization.