They don't have any bearing on things?
Worse yet, if this was training then the guards would have been on their best behavior. These things are taped* and watched by commanding officers. I deeply suspect that the MPs in this case didn't get the word that this was training, and the way they acted is SOP for detainees in Gitmo. In either case it is horrible.
Is this proof that there is torture in Gitmo? No. Rather it is a smoke -> fire connection.
Jay
* The tape has been lost. If this surprises you in the last, slap yourself.