Exactly, the Deep Blue's move explanations are boring - they all boil down to "based on the inputs and rules programmed, this line of moves has the best overall outcome to a depth of X" where X is however deep it goes.

You can try to translate that to human methods of understanding, but that's not how the computer "thinks", and attempting to do that translation leads to misunderstanding. Kasparov may make moves because he wants to get a better board position or knows his opponent is weak to certain positions (I have no idea how experts explain moves) but the computer isn't programmed that way.