Of course, that page is completely wrong about the large number convention in Canada. Anglo Canada (including government documents) uses the U.S. convention, and at very least uses period for the radix point. The shown convention only applies to Franco Canada, and maybe not even all of Franco Canada.

I see both in Quebec, so it isn't universal - even there. Meh, it's close enough to demonstrate. I prefer the US method, but that's just due to familiarity.