Most Canadian pilots have come up through the flying instructor route, I think. So it wouldn't be presumptuous to think that they don't have float experience.
320's fly to the Caribbean, so there are overwater routes. There are only a few aircraft so equipped, though - 213 to 217, 257 to 261, and 465 to 467 - I might be a number or two off there. Perhaps you saw the manual for one of the non-overwater flying aircraft.
Seems like something you'd want to have in there, though.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.