If by ultimate altruism you mean to reduce suffering and to increase life satisfaction, enlightenment may not be most conducive to such a goal. To the best of my knowledge, there isn't enough data to show that everyone regardless of background and culture will accept your enlightenment methods especially since the psychological procedures are based on a specific ideology (mainly Buddhism).
Also, if enlightenment here refers to the increase of knowledge I don't see how that necessarily reduces suffering. Some people suffer when they learn and don't like what they've learned. And if it's a uniform ideology that gives everyone satisfaction then it isn't necessarily right to instill one ideology, whatever it is, onto others even if it will reduce suffering.