The statistic alone doesn't tell the whole story. There are a host of tactical reasons for the woman making a self-protective move, such as the man expecting to continue cheating, drinking to excess, lying on the tax returns, gambling, etc—and still stay married; or the husband or his family having connections in the court system, so she needs to change the venue. Sometimes a man starts moving most of his assets to individual ownership or sharing money with a mistress, and the wife needs to put a stake in the ground by filing before all the assets get cleaned out. So many reasons.
Yes, I do believe that historically the males were the most likely to break the marriage and behave badly. These days, it's moving rapidly towards 50-50.
My experience is the 70/30 filing and causee of the divorce are related, or even more so. Especially today, everyone one of those reasons are also true for women and they get the added prize of divorce bonuses while men do not. Social media has really screwed up relationships in general. One example personal to me of many is the pastor that married my wife and I. He was married 27 years, had 3 kids all under 18, wife found her HS sweetheart online and just left her whole family one afternoon while they were away for sports, to go be with him and she filed for divorce as soon as 366 days hit (1 year here).