Thanks for this excellent assessment. It completely explains why I've only started to see this narrative in the past couple of years as the manosphere has become larger and more toxic. As I've noted, there are certainly many things that we can reasonably point to that white women have done, but these falsehoods do seem to be intended as a deflection from the fact that up until 60 years ago all women had hundreds of fewer rights by law than men, and that white men still hold the vast majority of power in all areas of society.
I understand that much of the manosphere is also quite racist, so it makes sense that they would try to pit marginalized groups against each other to prevent them from joining ranks and further threatening white male supremacy.