And I said they are different procedures. Someone intending to die in a pod is not the same as attempting to force someone to die strapping a mask to their face.
A person in a suicide pod is cooperating with the process not biting and scratching for precious life, potentially causing oxygen to leak into the mask and cause excruciating suffering.
I am not saying it is immoral to kill prisoners so you shouldn't use this method (although I say now it is immoral to kill prisoners and you shouldn't ever do it by this or any other method).
I am saying this method does not work for executions and you can't use it for its intended end.