Batshit crazy, yes. Brainwashing, no. You don't get brainwashed by reading a book or a site on the internet. You can, however, get lured into an organization that will, in fact, brainwash you (for example, Dianetics, leading to Scientology, or "What the bleep" leading to Rathma). That doesn't appear to be what's happening here (though anything is possible). It's just not a good way to recruit to put the full on batshit crazy stuff out in the open. Usually that only comes after you've been in a group for a while. The website seems to be just the anonymous scribbling of somebody who is clearly mentally ill. Reading it will not break your noodle unless it's already broke.
It appears that this text is written by a schizophrenic. I know schizophrenics are out of touch with reality, but can someone be really so ill to be able to write all that stuff.
One theory that I read is that the text was written like that on purpose, using language and certain terms in a vague way, to brainwash spiritual seekers.
The funny thing is, people on spiritual/metaphysical and conspiracy forums are accepting this text as the truth -
] (that thread has had more than 50,000 views).
Which just shows their state of mind.