I'm sure there are some wealthy Chinese people who have bought property in major cities as a way to park money. I'm just a little skeptical that it's in any way a significant driver of higher housing prices. I would be willing to bet that there are far more Canadians looking to buy housing in Vancouver than there are foreigners looking to do so.
The fundamental problem seems to be that there are more people who want to move to Vancouver than there are people who want to leave. It would be incredible if there were so many foreigners looking to buy places to park money that reducing their numbers would somehow change this fact.