[LVB]

There are a bunch of categories in the OP list I don't see either. Canadian happens to be on my mine, for whatever reason. Pretty annoying. (Almost as much as continuously recommending movies that I've already watched and rated.)

[pasbesoin]

The Canadian category (nor any "Canada/ian" category) is not present in the version of the "cheat list" I ran across.

It does work for me, though, in the U.S.

From my experience with the list I have, I am guessing that if your region, at the time you look, does not have any matches for the category, you get the "unavailable" response instead of an empty list.

I will note that the Canadian region has a number of items that do not show up in the above category in the U.S. region. Including several enjoyable comedies.

Also, there are some Canadian items I'm aware of that are available in the U.S. but are not showing up in that category. I guess some of those are TV shows rather than "Canadian Movies". I wonder whether there is a category ID for Canadian TV shows -- probably. Anyone have it?

Overall, from the recent list leak, it appears that Netflix has not, or not always, had a single, authoritative categorization. Probably multiple people/groups defining, including at different times, their own categories that often overlap. Also, I wonder whether internally they have tagging, with these category ID's defining/exposing specific combinations of that tagging.