Exactly the way I described it. I stated the X was a stiffer board better for higher speed, stability and carving, not buttering. He did not mention that he want a buttery playful board. He said his riding is mostly steep chutes, trees and all mountain. Me personally I totally agree with you on your statement. I like a board that has some butterability, (yea that's a word, lol). I typically like a dead center, middle of the road feel rating. I feel that's stable enough to bomb runs yet flexible enough to play around, but that's my style of riding not his.
No worries, mate. I do not disagree with you - we do not know enough about the OP's riding style to make a recommendation. However, if he is also considering the TRS and the Cobra, the standard Custom will be a closer match than the Custom X.