It’s an engineering sample that was produced before the final product was available. They use the really early ones to figure out if what they got back from the fab actually runs and how fast it will go safely. Later ones end up at motherboard partners so they can test their new board designs.
It is pretty common for them to leak out onto the second hand market after the final release. I’ve never heard of one that had any real problems, but in theory you might be buying something that has some issue that they hadn’t discovered at that point.





Two of the things in their list of “Hardware and Driver Issues” look way false from my experience.
Nvidia compatibility had been getting steadily worse on x.org for the four or five years prior to the switch to wayland. It is getting steadily better on wayland now and I would pick wayland from a stability point of view right now.
Multi GPU setups are night and day so much better on wayland. I look after a few different wacky multi monitor setups and the support for them is so much better on wayland, particularly 7+ monitors across multiple different physical GPUs, mismatched refresh rates, mismatched sizes, weirdo physical layouts and monitors that are being turned on and off during a session work considerably better.