Really great video showing the internal structure of the cooler. You can see the main copper mesh, and the copper which around where the GPU would be.
And as he notes, there is not enough water in it. So its sounding like a manufacturing issue. Which the OEM that was spoken in hypothesized as well. So then it comes down to how many cards ended up being shipped with this issue. And, its a bummer for AMD as this looks bad on them, even though they are not directly responsible.
All of their test samples could have been perfect, and then once manufacturing, all it takes is somebody setting up the machine to configure it to input less coolant than there should be, and then there are issue. Especially if there is actually more than one company making these. AMD could have spot checked cards, but they would only see it if they happen to check a card from that batch.