It does not.
Phantom power has a specific technical meaning, which is power provided across two modulation leads for balanced signal transmission. There are three standards for phantom power, one of which is now obsolete but sometimes still used, which are for 12V, 24V, and 48V (24V is obsolete). There are also a range of nonstandard phantom voltages below 48V, but all are balanced. Because phantom power is a standard, an amplifier that supplies it will support a very broad range of microphones.
Phantom power is called "phantom" because when connected to a transformer-output dynamic mic, the potential at the transformer's two leads (pins 2 and 3) is the same and therefore that microphone is not affected by the phantom power.
With active microphone systems, typically the goal is to eliminate the microphone bodies that can run on phantom power. This is a series of compromises; you enjoy reduced size & weight, and usually also reduced power consumption. You lose the standardization offered by phantom power, so you must rely on solutions customized for your selected active solution, which in the absence of standard means that each solution is custom and requires its own accessories, cables, and amplifiers. Most, but not all, active systems are unbalanced, and their output impedance is typically higher than what would be expected of a phantom-powered microphone. These factors limit the effective length of the cable from the capsule to the active amplifier (whereas a phantom powered microphone can drive cables in excess of 100m).
Thus, Nbox or any other specific active microphone amplifier does not supply phantom power, but rather microphone power in a custom format that is only applicable to the active microphone system it is designed for. It cannot be used with a standard 48V phantom powered microphone, nor can the active capsules run directly on P48 phantom power, such as your 70D supplies--they would need a format converter such as your PFAs to translate the two systems.