CBC (Canada’s BBC) article about this, non paywalled:

https://www.cbc.ca/news/canada/british-columbia/john-rustad-fatal-overdose-1.7348135

She said an exception was if a person was in their home in the area and under a doctor’s care when they died
then the service would not be notified.
Rustad told Tuesday’s party leaders’ debate that he saw someone die “from an overdose” on the corner of Robson and Hornby streets in Vancouver, later telling a news conference he watched first responders “pumping his chest” as an ambulance arrived.

Have to give benefit of the doubt here, unfortunately. The person may have walked out from his home and suffered a cardiac event there, where his doctor and assistant (mistaken as first responders) worked to revive him before taking him to his home in a special clinic car (mistaken as an ambulance with the emergency lights off/not flashing).

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