Quoting 100% of a number that's 75%.
In other words to the untrained ear, it may sound like they are saying 100% of the Adobe colour space.
Apple don't generally advertise their colour gamut in the way other manufacturers do. Smoke and mirrors and all that.
If the specs read:
100% sRGB
81% aRGB
In what way does that sound like they are implying 100% aRGB?