Give it a rest. The agreement was to not mischaracterize the content of USPAP and to not plagarize or resell their copyrighted materials including the content and instruction. Had nothing to do with some allegedly secret intelligence about the structure and operations of TAF. No secrecy involved. I wouldn't even call it an NDA when considering there's no limitation on "disclosure" beyond the agreement to not steal intellectual property rights from TAF.
I realize that this is a big intellectual ask, but consider the nature of your allegation: if TAF has dark secrets that they want to keep from the appraisers then of what benefit would it be to share those secrets with (by now) thousands of instructors? What can the instructors possibly do on the down-low for TAF other than to instruct per the content of the course materials.
There's no such thing as a secret in 2026. If TAF had been sharing secrets with thousands of current/former instructors over the last 25 years then why haven't some of them broken ranks for personal gain? Why aren't any of them validating any of your conspiracy theories? We have several people on this forum who are or were certified instructors. Why is it that none of them ever disagree with each other when it comes to the content, meaning and application of the material or how TAF operates? By comparison, the Appraisal Institute has all sorts of internal politics in play at any given time, all or almost all about individuals operating for personal gain.