It would be a mistake to take some % increase as general approval from a demographic. If the demographic already had very little support prior, all it shows is that wasn't as bad as expected. In this case, Trump's policy having fewer discriminatory outcomes than expected doesn't mean they aren't racist. That's not to offer additional commentary on if him or his policy is racist, but that increase in support doesn't contradict the possibility.
Areas with the highest covid death rates voted for trump does that mean his covid policy was sound? Minorities like many vote against their own interest. Good people on both sides. I will give you the prison reform thing but that was Kushner and trump later expressed regret for it, and it was pandering.
Trump gained significant ground among racial minorities. So...IDK how to square that with your characterization of his 4 years of policies.
PS. Lest you think the right has a monopoly on racism, I point you no further than California's attempted repeal of discrimination law (Prop 209).
This is the same sort of inflated rhetoric/tribalism the grandparent was speaking of.