So maybe I’m just misinterpreting your idea of what “anti-racist”
You are. Anti-racism is the lifestyle of fighting 'racism' in every day life. However, the definition of 'racism' has changed in academia so it's not actually about treating races unequally, it's treating the right races unequally.
So, in your example, if that business owner isn't hiring minority races over white races, they are not anti-racist, therefore, they are racist.
Being otherwise neutral to an established system is perpetuating it
See you're doing it here. Someone can be neutral to race; not making any determinations based on race, but if you say the established system, which you can't define, is racist (once again, the 'updated' definition of racism which says only white people can be racist), you want to claim anybody that isn't donating to the right charity, or supporting your causes, is racist?
So essentially, you've made 'racism' entirely subjective based on policies that you yourself (or the left in general) determines.
Racism used to mean a very objective thing: if you treat people differently based on their race. Now it's entirely subjective at the whim of one political parties definition.