Garneau's bafflegab seems to be hinting at crew training, that the Canadian industry is up to speed on the Max, but many other countries are not. Since he cannot discriminate against foreign carriers vs domestic ones, he's just shutting it down. Not sure the logic for ever opening up again - Canadian approval of all foreign carriers' training programs? Or just assurance that whatever mishandling or malfunction cannot ever happen again because of an additional layer of automation. He sounds like all the rest of the internet-whipped politicians instead of an engineer/astronaut.