There was this famous guy, which sold custom old Thinkpads, but with newer mainboards and Intel 10th gen chips in it, with custom USB-C adapters and all.
At some point he kind of disappeared and rumors appeared that he is now in mandatory military service, but will come back afterwards. Well, that was pre-COVID.
He also knows a friend that backports coreboot to the new mainboards. No idea how they manage to do that in a 2 person project like this. So yeah, all of the laptops they sell run coreboot in it (including the Thunderbolt EC, which is insane amount of work to implement).
Nonetheless the build quality was insanely good, and lots of folks were amazed by what they essentially bet blindly on when they ordered it. The X2100 would be my dream laptop, but I didn't manage to get one in time.