IMO, while James raised a valid question ("how do we know any of this is working, or even can work?"), some of his mistakes were in attempting to answer it (instead of solidly beginning a conversation); attempting to answer it on his own (instead of recruiting a diverse group of backgrounds to answer it); attempting to present his answers as more substantial than the underlying investigation could support (instead of doing a substantive sociological investigation); in the answers he provided (aligned with historical misogynistic orthodoxy); how he presented those answers (in a way not inviting or encouraging questioning); etc. I really, really wonder what would have happened if he'd sought out diverse co-authors.
Ironically, (AFAICT) the entire core issue of diversity in the first place is answering questions from/with only one perspective; and (AFAICT) much of the core issue of equity is having people with one perspective answering important questions for people with a different perspective.
So there really wasn't any possible way for him to succeed at anything beyond raising the question, on his own.