I have the similar ThinkPad like the author, except Gen 3, I7, 16Gb. Have Omarchy on it, works like a charm, even camera is not bad. Battery works but I can plug it in the same dock my macbook is (two usb-c dock).

While you can change keyboard or battery on your Thinkpad, they are cheap enough, around $500 that you can just get a new one. I get why he wanted Framework, they say 13" are much better and more useful deal then 16".

I wish Framework 12" is better, but it is not. Maybe Apple can dazzle us at this form factor.