You're not making an argument that my definition is in any way incorrect or overly broad. You're just making empty assertions because you don't like the conclusion.
Including "oppression" in there indicates that, in fact, you don't understand what "systemic racism" refers to. Also, that there's other forms of systemic prejudice; racism is simply one factor.My own wager would be that different outcomes between groups don't strictly require racism (or any other form of prejudice) to be the driver. For example, it's pretty hard to tell a story where Norway having more Nobel Prizes than nations like Spain is a result of Nordic people oppressing southern Europeans.