I call shens on the video. Think about it:
In "Let me express" the major sounds, in order, are:
L...T...M...X...P...S The "X" in the middle sounds like an "S," so this becomes:
L...T...M...S...P...S. Backwards, this becomes:
S...P..S..M...T...L
Now analyze "Serve Satan." The major sounds are
S...V...S...T...N
Where did the "V" sound come from? What happened to the "P" sound from "Let me express?" What happened to the "M" sound from the original? And where did the "N" sound at the end come from?
"Let me express" backward does not remotely resemble "Serve Satan."