It is true, there are other aspects to Magnuss chess proficiency. Adgestein's coaching when Magnus was in his early teens, must have been a factor. It is hard for a teen with other pressures to transition from a promising player (with much hype one must add) into a real premier player.

Notice though, that Magnus mentions that he is not even sure where his real chess board is. His chess time is spent at the computer.

Personally, I have trouble playing on a regular board after playing tons of computer chess, but then again I am an old patzer(2400FIDE).