To be honest I don't think any streets in Ontario that are open to cars are _legally_ anything approaching "living street" (wiki: "the legislation either grants pedestrians the right of way over or at equal rights to other road users").

But I might be wrong. A section of Simcoe St north of Queen is not explicitly signed as pedestrian priority but is made quite so by its design, and I ended up tagging that as highway=pedestrian (which I have seen described as "somewhere you can drive a car but probably wouldn't") because anything else I could think of felt wrong. Maybe design features here are similar.

We can ask the editor who made this a living_street twice: https://www.openstreetmap.org/changeset/63515583 or https://www.openstreetmap.org/changeset/87001482