Dorian didn't train HIT like many people like to act like he did. He did several sets...and ramped up. In fact, short of how he did his last set, I am not sure how people can call what he actually did "HIT". Not to mention many blame his style of training for the many injuries he sustained.
I can understand your interest, however....I just know the actual results I have seen from many die hard "HIT-ites" is not all that impressive. Just keep an open mind. If you want try that, do so. Just don't become one of those who ignores the actual progress being made as if the routine itself is magic.