There will be a chat with eBay staffers on Oct 4 (noon EST). That would be the time to raise this.
OTOH, it is also the responsibility of the buyers to make sure that the shipping costs he is required to pay are acceptable before ordering, and when he looks on that tab, it will also tell him that the seller may not ship to Canada.
If a seller ships to Canada, the listing will appear on dotCA (here). The price will also show in both loonies and the currency of the original listings.
Giving three good reasons to look at both tabs in the listing.