Speaking philosophically, rather than legally, it might muddle some issues about intent, but it's not exactly going to negate the more concrete crimes that were committed.
I think that the kerfuffle about Critical Race Theory is manufactured outrage about a concept that is not accurately described and a depiction of its influence over society and especially K-12 education which is almost wholly invented.
The right-wing outrage machine are people who don't care one jot about what Critical Race Theory actually is, the historical claims it makes or doesn't make, the legal and political remedies it suggests or doesn't suggest, the metaphysical claims it makes or doesn't make. What they want is for public schools to promote an understanding of US history that ignores the atrocities it has been built on and the enduring legacy of those atrocities, and glorifies the particular white, Christian, and capitalist culture that has dominated its politics and generally characterized its right wing.
Critical Race Theory, while it is a thing that has been around for quite awhile, has been distorted beyond recognition by what are very generously and somewhat absurdly called its critics-- absurdly because they generally can't even articulate what precisely Critical Race Theory even is. Indeed, they literally don't care what it is.
It's just a brand to them. A brand of their own making. They'd be calling it "cultural Marxism" or "cultural Bolshevism" if those two hadn't already been tried.