Answering a question other than the one that was asked is a common avoidance technique used by politicians. It allows then to simulate a conversation and fill the air without actually saying anything.
Paying a modicum of attention to the actual content of what a politician says and rating how relevant what they say is to the matter being discussed is a very effective way to quickly determine whether you're watching a guy with real convictions you want to vote for or a con artist.
I don't find Poilievre's performance wild so much as depressingly common.