Well, the 90% statistic you quoted refers to the article: https://www.asanet.org/press-center/press-releases/women-more-likely-men-initiate-divorces-not-non-marital-breakups and when I look at that reference, there is no actual data supporting the 90% figure. The word college doesn’t even exist in the article. So, this is why this appears to be unsupported. It’s probably a made up statistic, but it feels about right.