That's interesting. The way I read it, I understood that the mystic can spend an action to access the pool and activate the power package, all at once. Otherwise, it would be really quite underwhelming, to spend so many combat rounds trying to activate lower level powers one by one. If trying to activate multiple non-concentration powers, why not just use the common PSPs? And if trying to activate multiple concentration powers, by the time whatever the mystic planned is finally online, the battle might as well be over already.
If I understood correctly, it would work as a multipurpose power activated all at once, at the same moment the mystic uses their action to gain the special PSPs. The way psionic powers are, limited compared to higher level spells, it would give a lot of flexibility, but at a somewhat limited ceiling. And I am quite ok with the idea of 11 points, equivalent in price to 8th level spells, as they get four of them per day. So, not as many as a 9th level spell sounds reasonable.
I've being toying with the powers a little bit, and so far I have not managed to find a combo as powerful as the higher level spells. Considering it is really fun to mix in whatever looks good for the occasion, and the fact that it feels like always having a useful tool for different circumstances, the lack of raw power really seems a fair tradeoff.