Be critical of these sorts of factoids. Aristotle was a 'wise man' which in that pre-scientific time meant more seemingly-wise than actually-wise regarding most topics (although Aristotle was better than other contemporaries to be fair). You can take it as weak evidence that Aristotle claiming the self to be in the heart and not in the brain means that most people of the time thought it was in the brain not the heart, as with today. His view got recorded for history because it was contrarian.