I honestly don't understand the desire for municipal grocery stores at all. Grocery stores famously operate on super slim margins, so it's not like they're raking in the dough. Many of them are often run extremely well. In Texas, HEB is so beloved that a lot of people consider it far better at disaster recovery operations than the actual government.
I'm not against plans to better help people afford groceries, but somebody needs to at least explain how the plan is economically rationally viable, not just "let's try something new!"