Just because a policy does not solve a problem outright does not make it symbolic. The article discusses other measures that have already been implemented and points out that current housing prices are way off their peak from a year ago. If this policy further reduces demand even a little, that will have an impact on the trajectory of housing prices. That's not symbolism.
It is symbolism when everyone who is paid to think in this space considers it not to be a solution to the root of the problem, which is a lack of housing supply to keep up with job growth. You've banned foreign investors, great, there are still domestic investors who will fill the void in the market like gas in a small room. If you want there to not be investors, then housing shouldn't be such a great speculative asset to invest in, and it only is such an asset because local governments have opted to constrain supply and support investors rather than the workers they represent in their constituency.
> current housing prices are way off their peak from a year ago
The only policy that impacted this was the Bank of Canada’s interest rate policy. Houses were rocketing up right until the moment rates started increasing.