I'll be honest - I'm having a really hard time wrapping my head around this. I mean, the end result is nothing short of brilliant. It sounds incredibly similar to the original, which is nothing fancy, until you see that everything was recorded backwards — the vocals, the drumming, the guitar... Think about it, the guy had to do reverse inflection and reverse singing. You can't simply read a word backwords, you have to rework the tones and all of it — while singing.
Watch the result first:
And then watch the true forward version: