>>7219210McFarlane always lowballs the articulation count because it's referring to the number of joints the figure has.
So the Revoltech-type joints they use are 3 PoA, but they only count it as 1. Same with the barbell joints that they use, where that is 2 PoA.
The only time he ever counted them right was with the earliest Halo figures. Around the time Reach/ODST came out, they had 30+ PoA, yet the packages only said they had like 20PoA.