I hear you, though I’m unclear why you think the specific medium Weiss uses to express racist thoughts would determine the content of those racist thoughts.
There are many paths we can take to discuss the ways that Black lives are not valued in this country. The issues of violence within the Black community in Chicago are one reflection of that, but we can consider that alongside the equally important issue of police officers murdering Black men, women, and children. There’s no reason to use one to negate the other, which is what Weiss did.
Her reaction - specifically her need to blame Black people and exonerate White people in discussing violence against Black bodies - speaks for itself, whether she’s writing a review or an op-ed (which in a way, what is a critical response but an op-ed?).