Yes, he accepted that its only 2% of the people who have travelled and got infected but there are 35-40% of the people who does not know the trace(may be they are hiding, who know?).I dont think so as it gonna beat the whole purpose of stop the spread of virus. As per news, travellers coming to Canada contribute 2% in virus spreading but they want to make it to 0%.
Also, this could be the safeguard to ease out current travel restrictions and make way to CoPR holders issued after 18th March 2020 and other applicants.