Yes, I think you summarized the numbers.
As you said, there are planned increases in the carbon tax going forward. The direct impact of that on the three fuel components.... It would have an impact of about 0.15% each year on the CPI going forward. If you eliminate the tax, you'll get a one-time 0.6% decrease in inflation. The next year, it will go back to where it was, because you can only eliminate it once.
However, yes, I see your point. You're also eliminating the future increases.