FlightAware certainly does not have direct access to Canadian radar data. They use ADS-B info from different sources including commercial satellite tracking services. There is a lot of trafic FlightAware does not see and some we don't see simply because our radar system does not subscribe to FlightAware's ADS-B network.
So DaveReidUK is correct in saying that FlightAware data doesn't mean radar contact or radar service from ATC.