That is a thoroughly oiled gun, just like a new gun purchased that you have to clean out before use. They failed to mention in the video that type of "oiling" is done to a spray gun which will be stored and not used for a period of time greater than a week.
The oiling I do on my guns on a regular routine is the needle at the trigger so the needle freely passes through the packing nut, and also on the air cap threads to help reduce galling of the threads from repeated removal of the air cap for cleaning.