I'm sorry, but that is bullshit. The first, dominant, and overpowering oppression is violent class dominance, class segregation and class discrimination. Race and gender are side shows that correlate: They are not the driver.
"Intersectionality" is a pseudo-academic service-intellectual cover for professional-class managers who benefit from race and gender-rights posturing, while supporting class-dominance violence.
[Taking some heat on social media for this one. Like I glared at a sacred cow or something.]