Those are cherry-picked high numbers for EVOO and low numbers for canola oil. I have seen 450F/230C as a more common high end figure. I cook with sunflower oil which ranges 440F-480F and ghee which smokes at 482F.

I would also like to note that the original discussion was about caring for and seasoning cast iron pans which occurs at temperatures close to the smoke point of the oil, not about frying or sautéing. Cast iron pans are often seasoned in the oven and even used for roasting or baking at oven temperatures exceeding 500F. I would never put EVOO into an oven like that unless it was protected (such as included in a pizza crust) but even then I would prefer to drizzle the olive oil over the pizza after baking rather than before, due to the volatility of all the aromatics.

I have cooked plenty of times with EVOO but I would never use it for stir frying!