Mostly this^
but I’ve always interpreted more in terms of;
some people think things are how they are because class
some people think things are how they are because gender
some people think things are how they are because race
some people think things are how they are because …etc
but all these concepts intersect and so the fundamental tenet is that we do not have equality if any one group or individual is seen as inferior/unequal
or in more philisophical terms the importance of activism is not to improve your own (or your own group’s) position but in fact to lift up from the bottom
There’s a really good Angela Davis lecture in which she hammers home just how important it is that Trans Women & in particularly Black Trans women are recognised fully because of the reason that they live at the very sharpest edge of the violence of hate & intolerance & to leave them behind is to act selfishly which ultimately leaves us all behind as a society