Pay for equal work has been at at least 97% for at least a couple of decades. Even NOW has acknowledged that. Where you get the 70% figures is when you look at all working women compared to all working men without regard to what they are doing. That climbs to the high 80s when you look at the types of jobs each select; into the low nineties, when you look at continuous experience; and into the high nineties when you look at the subcategories within jobs - like did they take the hard math side of sociology, or the “let’s talk about it” side.
This part is pretty well established. What is open for debate is what is the cause of that last 3%, as well as the trend since the 1990s for women to be (slightly) overpaid in large businesses, and in organizations which have been traditionally male dominated. The first appears to be a combination of actual difference in abilities, and a difference in negotiating aggressiveness. The latter appears to be lawsuit protection in a de facto quota system.
Is it really too hard to read the research from official sources, and stop talking out of your hat....the 80% is certainly explained in details, and does not lend itself to interpretation, it is interpreted to you. Maybe you are agreeing with the research but the premise statement is true as I made it, period. Closed discussion...I do not make the statistics.