I mean, I don't disagree with racism being involved and all the second order effects that causes. But not looking deeper into the actual mechanism is like figuring out that the planets revolve around the sun by some magical force and then deciding that god did it and closing the book. I'm much more interested in the specifics of what racism does that causes premature aging because then that means we can actually do something actionable about it rather than adding to a list of reasons why racism is bad.