This is such an obvious ploy for the government to steal millennials' inheritance. The boomers will sit in their $2m houses all alone watching CNN all day refusing to sell while deferring the tax such that when they finally die, their house has no value in it (due to the deferred taxes) and the property is forced into sale such that the government receives pretty much all the proceeds from the real estate upon the death of the boomer.
Also, the marketing here is also tricky. They want you to think it only impacts 9% of houses in Canada... except most of those houses are the boomers AND in 20 years (when the boomers die), if housing prices increase at their historic rate, the tax will include 85% of all Canadian properties.
This is such obvious theft it should be execution worthy. Heads should be rolling.