I know but listen to this logic by codemasters. If they say that this game is Region Free then what else could they possibly mean that if you have a PAL Xbox in Canada that this game would work which I highly doubt they would be saying because PAL Xboxs I believe do not even work in North America. I do not understand what else they mean other than this game will only be PAL Versions of the game but its region free.
I asked the same question on Xbox.com on the forums and I got a reply from a member.
If the developer has confirmed the title is not region locked, you should not encounter any issues. Because they did not release to Canada/US, they simply don't support users in that region, hense the disclaimer.
According to this member they just do not support users that doesn't mean the game will not work does it
For those who do not believe me still check this out.
YouTube - MY PAL Xbox 360 play NTSC games HELP ME
A fellow has a PAL Xbox 360 and he plays a region free game and it works fine. So basically if the game is region free it should work.