If you look at the T&Cs for the card (footnotes) for each benefit it will say which benefits are applicable to sup card holders.
CIBC Aeroplan Visa Infinite Privilege Card primary cardholders and authorized user(s) are each entitled to complimentary access to Air Canada Café and any Maple Leaf Lounge located in Canada and the United States, ...
In general, airport benefits will go to the sup card member too. Including lounge access, free bag, priority check in, zone 2. Not sure if they get dragon pass too.