Update on my situation because I know were all very frustrated with this whole process... Decided to call some different dealers, multiple stated that they are pretty much receiving zero allocations for AT4. They're only really receiving allocation for AT4x (one dealer had 7 available for purchase) and base models. Stated that if you have an order with a tech package that has yet to be accepted (2000), you will likely sit for another 6-10months before moving to 2000. Heard this from two separate dealers. Spoke with my original dealer I placed an order with on 1/31 (AT4 with tech, 6.2) and they confirmed this and even went further stating that they are expecting GMC to release a statement in 1-2months that if you haven't received an accepted order w/ tech package, your order will be "postponed" till 2023. Thankfully, I was able to find another dealer that had my exact original order (with tech package) already sitting at code 2000 available for purchase.
But from what it sounds like; unless you want an AT4x or base model, or if you already have an accepted order; you make be out of luck.
Crazy times....