@BowsacNoodle @burner @MisterLister @monsterislandcolonizer @yockeypuck
Not entirely. On the older Thinkpads (x230, t440, etc.) you can overwrite most of what's in the 2 onboard roms and then lock them.
Neutering is a better description. Only the very old ThinkPads can be completely libre-booted but it won't be a productive user experience unless you're Richard Stallman and live inside emacs.