People with autism-spectrum disorders are well demonstrated to be able to achieve hyper-normal ability in specific areas of motor skills. I had a 12 year old kung-fu student with Aspergers, and his formwork was really amazing (although he lost his edge when he came into contact with an opponent). I had other students for longer and with seemingly stronger basic ability who never *got* the forms the way this boy did. Now he's 17 and spends all his time playing X-Box.
So, did he cheat, or not? Maybe, but if he did, Microsoft really ought to give him another chance. The real problem here is that they refuse to slap him on the wrist and then clear the tag. Whether he's autistic or not, he's 11 YEARS OLD. A "no strikes" rule before permanently labeling a kid a cheater is really draconian way to deal with a child.