I'm not sure I'm following you wrt Audre Lorde, maybe in part because I've never been sure of what Audre Lorde meant by that aphorism.
If I understand you (your interpretation of and disagreement with Lorde) correctly, I think the point would be that in the struggle against domination/hierarchy/etc., one has to make do with what one is presented with. You say, "The master's tools might be the only ones we have." I completely agree with this statement, and so does Marx, I take it. That is, I think the idea of self-reflexive immanent critique (in other words historical materialism) implies:
1.turning your situation against itself (both intellectually and materially - part of the point is that the intellectual and the material are related)
2.attempting to ground your ability to do this in the contradictions of that situation. (that's the self-reflexivity part)
But I might be misinterpreting you/Lorde, since I'm not sure which "tools" you/Lorde have in mind. I was just looking over the talk where she says this and it seems wildly unclear to me.
Is the Attentat critique of critique online anywhere that you know of? Without having read it, my immediate reaction is just that I understand critique to be an attempt to identify both the limits and the possibilities of a thing. In my mind that's certainly a kind of engagement, but one that tries not to be stuck with just hating the thing in question.
I think I understand the wish to disengage from things you hate, if that's what you/Attentat are driving at. Nietzsche says I think something like, 'where you cannot love, there you can only turn away'. I'm just not convinced that's possible with capitalism. Actually, I would go so far as to say that the very possibility of "turning away"/escaping things you hate could be the definition of a post-capitalist situation.
Also, since you brought this up before, I want to point out that although it's certainly possible to think of Marxists for whom this is not true, Marx himself really really has no picture of what a communist society ought to look like, and is remarkably harsh and consistent about rejecting any and all blueprints for a future society.