Trust me this is 100% real, it's been real since the 1960's. This is a REAL process of how the mind works naturally on its own. Plus you can prove it like you said, reverse the real phrases on Reverse Speech, backwards masking is just a vocal placed over a reversed vocal, and then put forward and mixed in. I did not put those messages in on my music, nor did anyone else on the live vocal recordings on that website. I recorded them all at different dates and I just recently reversed them and found those phrases.
Backwards masking is used to decieve or portray, Reverse Speech is the truth.