Intersectionality as originally concieved dealt with black women who despite being discriminated against because of racism and sexism and there being remedies in the law for both found they couldn't take a claim for both. It was seen as double dipping and they had to choose one or the other which meant one was left unaddressed. A good descriptor of how I've thought of it is given at the start of the video, I haven't watched it all but bits.
The male speaker then ballses it up by drawing up a Venn diagram, putting woman, POC, and disability and then colouring in the little bits that overlapped. Crenshaw's whole point was that they co-exist and are not separable and that a person is affected by both axes of oppression at once. It's not a partial thing and it doesn't help to add in the literal kitchen sink of supposed oppressions. Disability for instance isn't a constant, the degree and how it affects a person isn't the same depending on their condition while a black person or a female person is effectively stuck with it. If you were going to do it, you'd have to show two circles, with one on top of the other.
After that, it all goes awry, now it seems to be if you can claim any discrimination or as it is broken down into "identities" anyone and everyone can claim and they've turned it into a hierarchy in which of course white, non-disabled males can claim to be top dog if they like wearing dresses despite that they always had rights (like to vote or an education) that oppressed groups were denied. At worst, they might have been caught by laws preventing cross-dressing but those were primarily targeted at gay men so even then it wasn't about them.
Unfortunately what was originally a good concept is now being used to discriminate and perpetuate oppression on traditionally oppressed groups. I've seen feminists who worked to address sexism and sexual harassment in the workplace put down as not intersectional despite the gains they made and that it couldn't be foreseen that the law would be applied in a way that it was for black women. I've seen women told they can't speak about being female and how fundamental it is to them.
Really they've got it correct, it's now got religious features such as excommunication for not adhering to the doctrine but it is impossible to see how we can go from here when this mess of identities is now seemingly ingrained. Tossing out queer theory when so many have invested so much into it will be difficult.