Perfectly. You mentioned New Zealand. There is Australia too. Both are under the same jurisdiction. New Zealand is one of the world's largest producers of GMOs. There is no inherent contradiction. It is just that labelling is mandatory there.
We could easily make labelling mandatory in Canada too, even though we continued to produce them. Perhaps consumption habits would change, but the two things are not incompatible. You can see that in New Zealand, which produces GMOs.