I dont know the details of his imprisonment so i cant say yes or no, i will say like i did earlier that just about anything could be deemed torture under the geneva convention so im pretty sure that it could be argued that he has been.
again go read the definition of torture from the geneva convention and you will understand that there is an arguement to be made that he is being tortured in response to just about everything.
Well, the actualy word definition of torture is:
tor⋅ture /ˈtɔrtʃər/ Show Spelled Pronunciation [tawr-cher] Show IPA noun, verb, -tured, -tur⋅ing.
–noun 1. the act of inflicting excruciating pain, as punishment or revenge, as a means of getting a confession or information, or for sheer cruelty.
2. a method of inflicting such pain.
3. Often, tortures. the pain or suffering caused or undergone.
4. extreme anguish of body or mind; agony.
5. a cause of severe pain or anguish.
Well, none of them are isolation... You "may" be able to stretch number 4 to say it's extreme anguish of the body, BUT that's REALLY a stretch.
I think we almost all associate torture with a physical action.