Who started “Backpack Kid's Swish Swish SNL performance”?

Austin S. Harris, on X, May 21, 2017. It reached 5 platforms in 19 months.

LineageContestedKey steps, 9 of 16. Lines follow time and platform
Russell HorningBefore the first postAustin S. HarrisFirst postPitchforkPressOwner responsePeakOwner responsePlatform jumpAfterlifeBacklashPatient zero