Anything can be recovered with enough effort, technical knowhow and the right equipment. The distinction is what can be realistically repaired. Generally the term “unbricking” only exists because people overuse the term “bricked” (eg a phone stuck in a boot cycle isn’t a “brick”, it’s just “stuck in a boot cycle”. However if you do manage to fix a device by specialist hardware repairs then yes, I think it’s fair to say you’ve “unbricked” it.