Your first point proves my point - population growth is putting more demand on limited supply.
Read the article again, because no where does it indicate a crash is at hand, especially when the majority of neighbourhoods in the GTA still have price increases. There is a correction, but it will be temporary.
The new regulations aren't going to do much for the buyers who are buying $1 million+ homes. They have the money to ride them out. They may impact young, new buyers without that buying power.
Finally, if you look at the real estate markets in London, Berlin, Tokyo, New York, Boston, San Francisco, etc.. they all have detached housing that costs much more than Toronto's indicating prices in Toronto will continue to rise for single detached housing as long as people want to migrate here and continue to desire detached homes.