Exactly Zero
It’s interesting that we’re viewing this as a victory when 5nmol/l is still twice the top of the natural range for women, and testosterone level isn’t the only factor that gives men improved athletic ability.
Because the IOC started with the barmy 10 nmol/l we’re conditioned to think a reduction that is still unachievable for women is a victory. We’re frogs being boiled.
Men shouldn’t compete in women’s sport, no matter how much cosmetic surgery they have or what drugs they take.
I cannot fathom why this is even a fight we have to have. Except that men’s feelings are more important than women’s safety, women’s competitions and anyone’s integrity.