My point is that by the plain meaning of words you're right, disparate impact means any two groups impacted differently, regardless of anything else. In law, it

My point is that by the plain meaning of words you're right, disparate impact means any two groups impacted differently, regardless of anything else. In law, it means that an employment, housing, etc. policy has a disproportionately adverse impact on members of a protected class compared to non-members of that same class. It's much more specific and narrowly defined.