Fierce, what you seem to not take into consideration is those articles are as wrong as you are. The CBA is a huge document with tons of details that most beat writers, heck most NBA writers, do not know all of. They have basic knowledge but that's it. Then it just takes one writer to publish wrong info because they think they know all the details, but they don't and suddenly others read that article and publish more bad info based on the first bad article. I am sure that is what is happening here.
Larry Coon is widely regarded as an absolute expert on the NBA CBA, has been for well over a decade, and his site is the pre eminent website on NBA CBA information. What exactly are the authors' credentials regarding the NBA CBA who wrote the articles you are quoting? Are they regarded as NBA CBA experts? No, they aren't.
It's real simple:
On that Larry Coon site, as has been posted multiple times, it states you can't be traded until 6 months have passed after signing an extension. There are no exceptions to that rule written anywhere.
The Poison Pill Provision takes place after the 6 months have passed after signing the extension and is in place until that player starts his new contract. If Jaylen had signed his extension in July then in could have been eligible to be traded in January. Because he signed it in October he can't be traded because his six months expire after the trade deadline.