If accepting American or Russian help would have helped save Canadian homes and businesses, we would have. The South Africans are here for diplomatic reasons more than anything, and they arrived long after the critical period when we were trying to protect property and lives.
This isn't the California wildfires. It's not threatening populated areas anymore. It's burning in a vast expanse of unpopulated subarctic forest. It's fine. The damage is done; now we wait for it to burn out while keeping an eye out for the next one.