It's talking specifically about racial discrimination that results from <long list of interrelated things>. I don't think that means "any kind of error" and I don't think white people are racially discriminated against for having higher meth usage.
You really misunderstood me. I didn’t claim anything about white people; I gave a hypothetical scenario. And that hypothetical scenario wasn’t about white people facing discrimination for higher meth usage, only that such an inequitable distribution of meth usage seems to satisfy TFA’s definition for structural racism. The fact that it seems implausible to say so suggests the definition is not especially useful.