Prices are in Canadian dollars, but I didn't know this until I looked up the restaurant. $11 felt kinda high for a döner, even a really good one. But that works out to ~7€ which is a little high for Germany, but not that much higher.
The article reads very different when the location is known. Tourism is significant effected. City shopping is significant effected. People who work in expensive offices is exactly those that often have the option to work at home. All the talk about margins feel like distraction of the fact that restaurants at central shopping streets are going to suffer. It is thus questionable if the article has anything to say about the industry as a whole.