I would not class someone in a persistent vegetative state as brain dead. My understanding is that for organ harvesting to take place the subject has to be brain dead.
Sure, and I’m far from an authority on these things, which are fortunately way outside my usual experience. I don’t know all the policies or laws or ethical guidance involved. My sole point was that someone opening their eyes and seeming to look around isn’t solid proof that the person is deliberately trying to take in their surroundings. By analogy, a football player laying on the ground with their arm up could be waving to the audience, but they could also be showing the fencing response to head trauma. It doesn’t mean they’re intentionally sticking their hand up. It could be the case, but it’s not proof of it.