Didn't watch the video, but as I understand actors is that you can have trillions of instances of your actors, but you're not having a large number of actually different actors. For example let's say you have a server that handles requests. You implement the request handler as an actor and for every request you spawn an instance of that actor to handle that request.

There will be zillions of different kinds of Actor in a massive inconsistency robust ontology, each with a different implementation although constructed on a common system.