Why would you call it a grocery rebate when it's just a GST rebate?

"Can anyone tell me what's different about this grocery rebate and a GST rebate?
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This was simply some cheap marketing that the Liberal government put out there to help them maybe push back some of the trouble that people are feeling. Food, in some cases, has doubled in cost over the last couple of years. Food inflation, consistently near or above 10%, continues to be a challenge. This Liberal government's response is cheap marketing. I think we know where that goes."