"A canoe is deeper, wider and fatter (like some Canadians perhaps ;)"

Not sure about Finland (where the article's author lives), but a wide, fat open canoe is actually called "a Canadian" in many parts of northern Europe.

The concept of an "open kayak" sounds pretty confused, though, given how they were originally built (skins wrapped around a thin wooden frame) and used (coastal sea regions, including the open sea).