Cedar Point and Canada's Wonderland are not within a 100 mile radius of each other. Maps are an easy tool to use to confirm this. I also really question the exact definition of this Cedar Fair rumored rule if it is even a rule to begin with.
You also have to remember, that Paramount owned Canada's Wonderland when Flight Deck/Top Gun was built. It was Paramount's decision to make the SLC instead of a B&M Invert, and at the time, the SLC was an exciting new concept.