We're not here to comment on potential political situations that may happen in Canada. We're to describe the instrument that is presented before you.
You just mentioned the GST and HST. This provision is not there to solve what you perceive to be an issue. It's a policy decision that the GST or HST applies on the final selling price of property or services. It includes the gas tax, and it will include carbon pricing because it will be built into the price of the fuel that's going to be sold.
The double imposition I'm talking about would be a double imposition under this particular piece of legislation where it is not the intention.