Systemic racism is something different. It's the legal system being set up in a way that favors/disfavors certain groups. It's not something a person does.
Yes, it's power + racism, which is the idea that the "power+prejudice" redefinition was getting at with the added clarification that the power has to be real rather than in the eye of the beholder. It achieves the stated purpose of the redefinition but without providing cover for people who want a reason why their racism is good while yours is bad.
