While I don't know for certain, I expect that the ownership of this site is simply tired of the nonstop chaos that is the Aiming Section, especially anything revolving around CTE. You guys have been at each other virtually nonstop for decades in some cases. (Here and elsewhere) I expect that its simply not worth the aggravation for them any longer.
There are instances here on the Main Forum where those rules get broken regularly, just not to the spectacular extent of the Aiming Forum. The Harriman stuff has gotten rather silly over the years, as one example.
I bet they never figured on having to be a playground monitor when they set up the site initially. It is never ending.
Just my guess as an observer outside of the general conflict.
What is it with aim? Seriously. It's not personalities on the forum. The only lessons I've given where people freaked were where I showed "secret" aim methods too early in the lesson, before they came to understand I can help with stance, stroke, position play, etc. first.
There is IMH experience a scary amount of APA 6's and below who shoot to different sides of the pocket depending on o.b. position, meaning they don't shoot everything to center pocket. When I show them the center between the points is the optimal point for the base of the ball to pass over they freak (sometimes).
I actually push a ball slowly with my fingers along the rails until they come to understand what part of the pocket to aim for (unless they are cheating the pocket, of course, or throwing balls to one pocket side with TOI CJ-style, of course). Is that an aim system? I think so, "Hey, stop cheating every cut shot you try and start aiming them all to center pocket!" Do people freak out? They sure do.
Aim becomes like magical thinking for players who struggle, one day better with aim, one day worse. Obviously this can come from simply taking different stance positions day-to-day. The mind abhors a vacuum, so tell an aimer their magic is non-magical, they freak (tell a troll anything not in a pool book for the past 100 years, they freak).
I'll throw in a shameless plug for my teaching here (I'm very shameless). I love to tell students "I've not had a bad play session in years" because I adhere to fundamentals and teach them (just like my golf or desktop publishing or vocal music teaching, or whatever). I feel subtle differences between sessions but never play far below my average abilities. If you're not a 600, I'll get you there (though I'm not sure what a 600 Fargo is). I guess there's that.