This seems a bit of a leap to me.
It's a bit like saying a King or Queen is morally ahead of you. You're taking a point of concentrated wealth in a system designed to create that concentration and comparing it to 1 individual and using that to support the system.
I can see why that works if you think you are likely part of the concentrated wealth, but it seems like it would fall apart under the level of scrutiny that effective altruists alledgedly put in.