I will be interested to hear what sort of condition he is in: weight, bedsores, contractures, decorticate/decerebrate posturing, trach for a ventilator, etc. And what was the cause of this coma? Botulism can indeed cause a coma due to untreated respiratory failure, but patients can be put on a ventilator.
I wonder if NK deliberately caused his brain injury to either make sure he never speaks about his experience, or as a warning to other tourists who run afoul of the NK government.