They might have confused it for a head transplant?

Although neither patient was alive at the time of the transplant.

I don’t know if a full brain transplant would be feasible, or even a good idea. Not only would none of their senses and motor nerves work for weeks while the brain and nerves re-established themselves, but they would be walking around in a dead person’s face, body and speaking with their voice. That seems genuinely horrific.