I think he meant the right to be killed moreso then the right to suicide. However, there are other contexts where the right to suicide makes sense, such as terminal illnesses that leave your mental faculty intact. If you are stuck in a hospital bed, surrounded by doctors, with a machine reading your vitals continously, it can be very hard to commit suicide. Even if you manage to, it would probably not be as pleasent as the morpheme overdose a nurse could give you.

Speaking from the personal experience of having watched a family member die of dementia, I absolutly agree that we should have a right to die. The only arguement should be about where to draw the line.

In my case we had a woman who watched her own mother go through dementia and was very clear in both her will, and in speaking with her immediate family that she never wanted to be kept alive in that state. In addition, by the end, the entire family was in agreement that she should be put down, and (as far as I am aware) every medical professional we spoke with agreed with our decision to put her on a DNR and avoid life prolonging treatments to the extent possible. I cannot imagine that a hypothetical ethics board would come to a different conclusion.

Despite this, she stayed alive until she died of dehydration as a result of loosing the mental faculty necessary to swallow when water was placed in her mouth.