I assume he means natural-born Canadians rather than naturalized Canadians.
That said, I think his statement is not quite accurate. Very few people are aware of (or think about) the monarchy at all, and of the ones that are, very few of them actually care one way or the other about it. Of those, I'm sure most agree that the monarchy is pointless, but unlike in the UK we don't spend a whole lot of money on it so in reality no one really cares much except on principle.
That said, I think his statement is not quite accurate. Very few people are aware of (or think about) the monarchy at all, and of the ones that are, very few of them actually care one way or the other about it. Of those, I'm sure most agree that the monarchy is pointless, but unlike in the UK we don't spend a whole lot of money on it so in reality no one really cares much except on principle.