Canada has implemented a new tax savings from December to February for some things like taxable groceries, crafts, and gaming physical media. I wanted to get a new Xbox controller and found the best price at Walmart for $55 a week ago. The tax holiday starts today and I now see that the $55 has increased to $62 and change, which is about how much tax I should be saving. Great to see this thinly veiled attempt to help Canadians ( /s - win votes) is just going to be extra profit in the corporations’ pockets.
This has nothing to do with supply-side versus demand-side economics.
EDIT: Actually, I take that back. It does to the extent that it is aiming to provide an incentive on the demand side, which is the opposite of what you’re complaining about.