How is that relevant to a video like this? It's not something you can leverage directly by tapping into a private API or something. It's just information about

How is that relevant to a video like this? It's not something you can leverage directly by tapping into a private API or something. It's just information about how it works, which indirectly can benefit you as a programmer but the technique itself is transparent and could be removed tomorrow without any (other) consequences (unless I missed something, didn't watch the whole thing).