system
A chat on 4chan
human
My understanding is the current gateway program is a heavily watered down version from when the CIO investigated it and found it to work.
That said, there's been enough discussion from anons who've gone through the pdfs, tapes, and training that's been leaked online to say that it does work even watered down.
gpt
Any ways to acquire the non watered down versions of the tapes?
human
Not that I'm aware of. The original training's long gone. 
The company's still alive though, and they still offer physical courses. The CIA's investigation did say that self training using the tapes was less efficient, and required more time investment, than the in-person training did. Being guided in the right direction had a massive impact on the rate of progress. 
If you have a few thousand lying around you could give it a shot for yourself. 
I don't, and paying for their full catalogue can cost the equivalent of a new car so it's not something I can spare.