There are two issues here. One is whether Actual Freedom's approach produces the claimed effects and whether those effects actually improve people's lives, and the other is whether it's a cult. There's a minor question of whether Actual Freedom is the only path to get those effects.

I don't think it sounds all that much like a cult-- they aren't asking for money, they aren't asking for devotion to a leader, and they're saying they have a simple method of getting access to an intrinsic ability.

Whether it's as absolutely true as they say is a harder question, though it might improve quality of life without working all the time. Whether it's safe is a harder question-- it sounds like a sort of self-modification which is would be very hard to reverse.

Whether no other system produces comparable results is unknowable.