I remember checking it out myself when I was young and heard exactly what was in the OP video. Got no explanation or opinion really, but it does say shit when played backwards.
But really, do we need to play it backward whenever the lyrics played forwards are very rich in occult symbolism as well as the album artwork.
Honestly if any band was/is in league with Satan it's got to be the rolling stones, I mean didn't Kieth Richards die in like '68 or something, or at least he sure looks like it.