Let me rephrase for the ones interpreting things in the most strictly literal way: Freddie had little knowledge of what Stan's version of CTE entailed as Freddie learned directly from Hal.
That makes better sense. Hal could be thought of as a Johnny Appleseed of aiming in a sense because many people took him up on his offer to call him. I was not one of them.
Hal chose me, perhaps unwisely, perhaps not. But he gifted me with the knowledge that there are more ways to effectively aim in pool than were published at that time and he tasked me with teaching what I knew to others who might be interested.
So I do that. Freddie could describe every system Hal taught him in detail. I couldn't do that. But Freddie was not so interested that he had to find and quiz everyone that Hal taught and compare notes.
Hal taught to use the center and the edges. That's the most basic instruction he gave to me.
Hal also left behind tons of notes on the subject of aiming as I would have expected there to be. I don't recall if those notes are with anyone other than Hal's widow.
The overriding point is that there is a core to cte aiming which is used regardless of which "version" one uses. That core is what the skeptics and the knockers ultimately take issue with.
Knocking the refinements or discoveries of what Hal meant when he said do this or that.... Is just fluff to troll with because the core principle, that one can use three sighting angles to line up correctly for any shot is the one that pisses off geometers more than anything else.
What those geometers should be thinking of is aiming as a 3d exercise rather than just a 2d diagram in my opinion.
That's when we start to think about perspective, perception, visual acuity, illusions and so on.
We hear the claim and it sounds absurd and actually is absurd if one thinks only in 2d.