Adopting leftist music by perverting its meaning is pretty much the M.O. of far-right anthems/songs, no matter what the song was about originally. See: Tomorrow Belongs to Me, Fortunate son (to a milder extent), Born in the U.S.A as some of more well-known English examples.
I wonder if this was an attempt at doing precisely that, or was it just some publicity stunt for the movement.