The Dometic CFX line isn’t that new. IIRC they came out in 2017. This issue relates to users who plug into both AC and DC power at the same time, then turn off the DC supply, in conjunction with a part failure.
The problem is described here:
Dometic CFX3 Recall info thread | Expedition Portal
Yeah, the warning sticker seems like a cheesy stopgap solution, but they figured it out and have a recall for a circuit fix. And if you don’t plug both power cords into the box you’ll never run into the problem. Some people would never use it that way so it’s of no concern to them. Hence the sticker solution, and you don’t have to ship and wait for your fridge to be returned after some unknown turn around time.
BTW, anticipating such a failure mode scenario is why good engineering performs worst case analyses. It’s not easy.
They have made some changes to the user manuals for CYA reasons and uploaded revisions on their website. But who reads those? Take a look.