She was unimpressive in the "last presidential debate"? What last presidential debate? This was her first presidential debate. Also I watched her debate with Pence and she wiped the floor with him as well. The media didn't take much notice, but I did, which was why her performance with Trump met my expectations.
I grant your point that it is true that a critique of Harris or any Black person is not racist. I certainly wouldn't argue that.
My argument is the disingenuous line "but I need to hear more about policies" when all the "more" they could possibly want is out there raises the question of... what exactly are they really questioning? I merely posit a theory.
My theory could be severely damaged if someone happened to find a Black person saying "but I need to hear more about her policies." However, I haven't seen that in any focus group that happened to have Black folk, and I've watched several. *shrug*
Just a theory.