Both race and the circumstances of the crime are going to impact their being charged as an adult, and the sentence they receive. The existence of racism doesn’t mean that the circumstances of the case will now have 0 bearing on their punishment - it’s not one or the other; it is both.
Like I say, the system is racist, yes. It feels like you just seized on an opportunity to lecture about racism and deny the existence of literally any other factor being possible except for race. It’s childish and reductive and hostile to things that are necessary for understanding the world. Stop doing that. This will be my last message to you on this topic.
My assumption that the trend in this article is based on racism is because that is absolutely a thing that happens.
I could say that people order vanilla ice cream more than chocolate because of racism, and then if someone said that wasn’t true I could cite a bunch of statistics about how racism is absolutely a thing that happens and get mad at them for denying the impact of racism, and it would make an equal amount of sense as your argument here.