According to its
website, VIA has 14 Park cars in its current fleet - and that apparently excludes the 4 Prestige Park cars.
With the Ocean permanently operating as a bidirectional service, there are only two services left where these regular Park cars can be deployed sensibly: the Churchill service and the Skeena. Churchill operates with 3 sets (already including one set in maintenance) and Skeena with 2.
Recalling the nature of the Park car (i.e. that only one car per consist can be used for passengers), how could there possibly be a need for a 15th Park car?