Nav Canada has had ATC controllers sit in the ATC facility at Pearson airport while controlling multiple other airports for years or maybe decades. This is very common practice and all pilots know what an RCO is.
The only difference I can spot here is they get webcams. That's hardly an important bit as the ATC never has to have visual of the plane. In a controlled airport the pilot just has to declare I have visual and thats good enough. Works similarly for taxiing aircraft.