The 40% was just a myth not backed up by proper science.

The 28% is factually accurate and again...really really bad. For comparison though, 23% of all women report being the victim of domestic violence.

https://www.ctcadv.org/information-about-domestic-violence/national-statistics/

40% is not "true" in any way and the reality is that it's much closer to the general population, but still higher.