From the article: “... even if they have the secondary effect of speeding the dying process...”
That’s still killing a patient.
From conception to natural death.
If you want to die a “natural death” screaming in agony that’s your business. But keep your nose the hell out of mine.
That’s still killing a patient.
The goal should be to let the patient do as much "living" as possible. If a regimen of pain-killers transforms two weeks of agony into one week of comfort, the patient may end up dying sooner than without the painkillers, but may manage to do a lot more "living" before that time than would be possible without.
If the purpose of the medication is to give the patient more quality time, even at the expense of hastening death, there may be nothing wrong with it. Of course, in many cases euthanasia, the supposed "unfortunate side-effect" is in fact the goal, since there's no intention of improving the amount of quality time. But if a patient decides that one day of quality time is better than two days spent in agonizing pain, I would hardly consider such a choice "suicidal".