Bruh! There are Tiger Moth's and Bu 131's in this video. Cuh-ban for cabane. Also, half the "Pups" shown are actually Camels or 1 1/2's (and one SPAD, huh?).
Garbage.
Having said that, the Pup had its period of dominance from March to August of 1916. The Halberstadt D.II was a great airplane, but was outclassed in many ways by the Pup. It was a better match against the Nieuport 11. Once the Albatros D.II and D.III hit the front, it took over for a long time.