Now that I've made an adept, I see the issues in the core adept wording, but what is the answer?
How should power points actually be gained?
1. Power points are gained whenever your magic stat increases (as per page 156) and can also be obtained through taking the corresponding metamagic on page 168, but at character generation you can only have as many power points as are given directly by your priority table choice (as per the wording on page 66)
2. The text on page 156 is a bad carryover from 5e, and so you start with power points equal to the magic listed on your priority table choice (as per pg. 66) which can only be increased through the power point metamagic (pg. 168)
3. The text on page 66 is poorly worded, and the parenthetical that implies that adepts cannot start with more power points than their table entry gives is just trying to inform you where to find their original magic stat? Adepts can boost their magic stat at character generation, which gets them additional power points, as will later increases to their magic stat during gameplay (pg. 156) as will the power point metamagic