Sameness of a rational being is whether it can reach back in memory to another thing. They cannot be the same person they were before. Not a permanent or immutable feature of the person in any way. It is less like a pearl and more like a whirlpool. No self is present because that would require something constant, and there is nothing constant.
Self is an illusion.
You can never see it the self because we use our self to look for it. We create a self by creating a character that is reliable, loyal, etc. Here the video seems to come down on the idea that the self is a way of giving structure to our lives. It is the story we tell of who and what we are.