Cool video! It's very easy to do (provided you have the ingredients). The serving in the video seems to be for 3 people. It's a really greasy dish, there's no way you can eat all of that alone.

While cutting the guanciale he says "quite a lot for two people" and later while adding eggs he says "for two people you take two eggs" so it must be intended as a portion for two.

Big mistake: no olive oil should go in the pan where you cook the guanciale. Otherwise, everything else is legit.

Yes, even more that at some point he removes some of the oil/fat mix. What was the point of the oil, then?

This. Stuff like guanciale should cook in its own fat.