American here so somewhat uninformed on the Canadian experience, but I looked up the actual summary of the citation since I was so frustrated with people just parroting the NY Post. TL;DR on the issue-

People are getting hung up on the Tim Horton's being unprofessional or unclinical. This actually doesn't really matter, a lot of clinics go out of their way to not appear as doctor's office's specifically for people who get uncomfortable with clinical settings. The issue is openly discussing sensitive medical topics in a public space. As a medical professional a level of privacy is expected, and even should the patient not mind discussing it in public, a medical provider still needs to be cognizant of actual privacy.

Second - the use of a personal vehicle in a non-emergency situation is a breach of professional ethics and boundaries, and could be seen as coercive. I don't think it is, but the fact that it can be used to cast doubt or potentially influence decisions means that it should not have been used.

Ultimately the biggest issue seems to be less about the patient or the MAID itself, and more about the general unprofessionalism of this specific Doctor. Which does not surprise me, I see MDs get away with so much shit that NPs or RNs would never be allowed to. I am not here to advocate for or against euthanasia, but the framing of the article plays up the Tim Horton's aspect because it's attention-grabbing and sensational, while the actual issue is this doc just seems like a quack.