Ok, I've not given up yet..
I've found the restriction text here: https://www.ontario.ca/laws/regulation/070347#BK34
specifically:
however, the same link above states:
Power boats
31. (1) No person shall operate a power boat in a provincial park. O. Reg. 347/07, s. 31 (1).
(2) Despite subsection (1), a person may operate a power boat,
( a ) in a provincial park named in Column 2 of Schedule 1 in waters named in Column 3 of that Schedule if the conditions set out in that Column are met;
( b ) in waters that are partially but not entirely included within the regulated boundary of a provincial park;
( c ) in a wilderness class park in accordance with Ontario Regulation 346/07 (Mechanized Travel in Wilderness Parks) made under the Act. O. Reg. 347/07, s. 31 (2).
my understanding is that stormy / clear are only partly in the park so I don't see how they can enforce the restriction. now the launch IS in the park so maybe an alternate boat launch is the key here.