It is pest control. I don't eat wood chucks, gophers, mice, skunks, coyotes, feral cats or a few other things that dig up my place or try to eat the chickens.
I don't think the intent was that killing it was funny. He was just using a little humor in general about an obviously infestation level animal being not that. I see the difference, but would not have posted it for obvious reasons. What if he shot a spike and did a video making out like it was the new Tennessee state record? Wouldn't he possibly be very happy with something he was going to eat, but just having a little fun about the size of the trophy?
Nice shot.