AEW is known to have been quite proud of his awareness of "esoteric secrets", and he is said to have guarded them jealously, hinting broadly in many of his writings that he knew something the reader didn't, so
to them!
Consequently, if there was a true purpose or any direct usefulness to be conveyed by PKT, it is derailed entirely by Arty winking at you hoping you'll notice he's privy to something really cool, and start hanging on his every word in the hope he'll share it with you.
Sad thing is, now he's dead, and he can't share it with you, and his *legacy* is this confusing piece of twaddle that should have been great.
\m/ Kat
ETA: Pick the Crowley fan in the crowd