I don't really buy that. While technically correct, you are voting for a particular nominee, in this case Biteme. It can't be assumed that all Biteme voters would have voted for a different nominee. Many may have voted third party, for Trump or not at all if it were another D candidate.
You can believe what you want. But those are the facts as they are laid out in the Constitution. But yeah, your opinion is more accurate than the Constitution.