Increasing the inclusion rate for capital gains is something that acts as a disincentive, generally speaking, on capital investment.
However, what the government did was increase the inclusion rate for capital gains above a certain threshold and increase the lifetime capital gains exemption for shares in small businesses. In that case, it's not clear what the overall impact will be for productivity. It may well be that it increases the incentives for small businesses, but decreases them for much larger capital gains, such as those of the most successful businesses that generate the most capital gains.
It's not as clear-cut, because of the inclusion rate increase at the same time as the exemption of $250,000 per year.