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Can also vouch for this. Bought a 2nd gen AMD Thinkpad T14 ~last year and haven't had any issues at all running Debian testing (bookworm). Swapped the m.2 with a 4TB one and added an extra 16GB of RAM to supplement the soldered 16GB. I believe they're on 3rd gen now but I imagine hardware compatibility is probably similar to 2nd gen.

The size/form factor is basically the same as my old T460s which I've had for ~8+ years and is still running, but a bit dated now with a 2c/4t Intel CPU. I believe back then the T460s was the "slim" version of the T460, but Lenovo seems to have dropped the "s" for the T14 even though the dimensions of both seem the same to me, maybe a couple extra mm in height on the T14.