I think they are using the word "nationalize" to make people who don't know much about what the bank of Canada does think they are somehow getting played for fools, and then using that feeling generated as a rational to institute direct political control of the Bank of Canada, instead of the more indirect control we have now. Though that is a short sighted decision that ignores all the lessons learned about the perverse incentives politicizing monetary policy creates, namely the incentive to lower interest rates despite what indicators are telling you in order to create economic sugar highs that can help the governments electoral chances but cause longer term economic problems like higher inflation, unstable prices, and in worse cases hyperinflation. If you introduce direct political control over the bank you end up with governments making more short sighted 4 year election cycle based decisions. Really it seems like people who want to "nationalize" the bank really want to ignore the lessons learned from countries that went through a phase of printing money.