It appears that these are just base older Thinkpads with Libreboot. That's great, but not what I am referring to. There are people in China who are retromodding older Thinkpads with new screens, motherboards, and CPUs. The X230 I previously bought is basically the same thing as it left the factory originally, since it came with relatively decent hardware capabilities out of the box, but similar X220s are generally upgraded to at least a Haswell generation CPU / chipset. The big factor being that they are capable of supporting 16GB of RAM, which is a necessity for a modern laptop. An X200 can't have 16GB of RAM, and while 8GB usually works its not officially supported, the official maximum is 4GB.

I'd like a newer retromodded X series because I have heard that some folks are bringing them up to new enough generations of hardware that they support nVME disks, which would be a significant performance advantage over a SATA SSD, and the power improvements would increase battery life in newer generation hardware as well.

I'm fine if it's an X200 shell, but I don't want original X200 hardware.