I notice (for Starling’s benefit) that the player (Reg, I assume?) manages the C chord in at least two different ways according to his needs and whims. One is to build the C in the standard fashion, and the other is just to move the two fingers at the “low” end of the G up a string (makes the low C notes, and stays away from the high strings (and the low E string that is now open) if the player feels it fits the mood) and then back to the G.
There are many ways to skin a cat.