Until I am in the position that I have terminal cancer and have constant pain 24/7, I cannot judge this story. I guess others have an easier time with pain and suffering.
The Oregon record over the past 10 years shows that virtually nobody who chose suicide, chose it because of pain. It would have been "absolutely" nobody, if they had gotten the appropriate narcotic and analgesic medication.
You might want to look at the argument that the suicide option works against palliative care and these insights by an experienced medical practitioner as well. Of the many arguments that have been made in favor of suicide, the one that is provably false is the one about pain in terminal cases.