“Kozov: I think my point was that the Pashtus Halashon can mean whatever you want it to mean. Which is fine. Apikorsim distort the Torah all the time, but we don’t let that affect our interpetation of it. “
That is not fine. Just because Harotze Litos Yavo Viyite doesn’t mean you can do things that are Maris Ayin or Lifnei Iver. This is definitely Lifnei Iver, diHava Lei Lifaresh Vilo Listom or not say anything at all (in other words not support the song in any way), because it’s clear as day the meaning most people extract from it (and by your admission).