You dismissed one assumption and named three more. Please explain which applies to Occam's razor.
If you can then explain how your selection isn't related to structural racism and isn't politically convenient for you, I'd appreciate it.
Because there is a direct correlation between observable characteristics like obesity and poverty to health outcomes for people of all races. If a fat, poor white woman in Appalachia has heart problems in her 40s and receives low quality care, is that a result of systemic racism?
And as others have pointed out, we don't know the entire scope of genetic effects, but we know they exist to some degree (which was the whole point of the article).