It looks like this one got through the labeling process for Canada which uses alcohol content by volume as does the US and most of the rest of the world.
As mentioned above, British proof is calculated differently than US proof, which is twice the alcohol content and expressed as %abv.
It appears that the Canadian labeling authority was only concerned with the % alcohol by volume and not the proof statement.
Ambassador of Rum
Ministry of Rum
When I dream up a better job, I'm going to take it. In the meantime, the research continues.