So, intersectionality is a thing. All these problems are, on some level, connected.
But I can't help but regard the "racism is inexorably intertwined with capitalism" stuff with extreme suspicion. It reeks of this notion that if we can "solve" capitalism (by abolishing it and replacing it with another economic system) then we don't have to worry about racism afterwards. That just reads... so, comically, blatantly, obviously false to me. The specific forms of modern racism are of course a result of modern systems, but the xenophobia and tribalism at their roots predate all that by so, so much. "They're not like us" will probably always be with us, on some level. We will never stop having to deal with it.
So I don't blame people getting pissed when they have a really specific complaint about racism and somebody goes "well, can I interest you in this discussion about CLASS." Related, sure, but it reads dismissively.