Firstly if I earn 5M, it is my money. Not Canada's money. Not your money. Not anyone else's. It is mine. I decide what to do with my money, how I spend it and where I spend it. You do not OWE investments in Canada just because you have money, you can invest it anywhere else you want
Secondly, it was used as an example to convey the point that someone who is already rich and has a lot of money has little to gain from coming to Canada, because money can get you more outside of Canada, including a better lifestyle because Canada is expensive!. When you move to Canada you come here because you are trying to make it in life and want more opportunities and also because you like Canada's culture. So the example was used to stress the point that money that immigrants already have should not necessarily be such an important factor in deciding who will be good for Canada as an immigrant.
So no, it is not ridiculous and you are barking up the wrong tree here.