The armature in the blue collection named "armature" is a blender-only rig intended to be posed and animated.

The armatures in the red collections named "armature.game-A" and "armature.game-T" are rigs intended to be exported to game engines. They had unnecessary bones culled, constraints removed, and bone hierarchy changed to a standard humanoid FK setup. Pose/animate the bones in the "Posing" bone collection, let the game engine drive the twist/helper bones! Check the documentation for a proposed Unity constraint setup.