The BBC article title now says "Assisted dying" not "euthanasia". Often, the distinction hinges on whether the patient or a medical practitioner administers a substance that brings about death. The Canadian policy actually provides for both, but as I understand it the stats being cited in the article combine both, so only a subset of the tally are "euthanasia" deaths.
I have noticed that the line between condition and cause is often overlooked, even by doctors. For example this leads to people thinking Pinkeye/conjunctivitis is highly contagious, when it is still conjunctivitis if it is caused by getting something in your eye. I think that holds for everything that ends in -itis too Sinusitis, Arthritis, Tendonitis, etc.
I know that is a bit of a tangent, but you reminded me of someone who had bell's palsy telling me that it was actually shingles. I explained that just because it was caused by shingles doesn't mean it stops being Bell's Palsy, just like how it is still a cough if it's from the flu or from smoking. They ended up getting really angry at me about it, but I think hn might appreciate the semantics a bit more.
It definitely helps as a patient to advocate, and add anything that a physician like myself maybe wouldn't always ask, like if you've been a tick-infested area and/or discovered a tick attached to yourself recently.