That's the 3.0 version (talents are psionic cantrips, which don't exist in 3.5.) The version in Hyperconscious is 8/10 manifesting, not 6/10. (It only loses the first and last level... which means you can drop out at 9 and only lose 1 ML.)
In terms of manifesting and using skills that require concentration while raging - he can do both without problems.
I agree that qualifying at 6 will be hard though, because you need a 3rd-level power - which Psywars don't get until 7.Scratch that, I was reading the wrong PrC he can qualify just fine.
The requirements for the Hyperconscious Rager are:
To qualify to become a cerebral rager, a character must fulfill all the following criteria.
Alignment: Any nonlawful
Concentration: 2 ranks
Intimidate: 4 ranks
Knowledge (Psionics): 7 ranks
Special: Able to rage as a barbarian at least once per day or possess the volatile mind class ability