In Australia supermarkets certainly advertise fresh fruit and vegetables in multiple forms of media. And not just "we sell vegetables", but "this week Australian grown XXXX are just $Y per kg!"

Australian readers can probably hear that Coles announcer voice in the heads right now.

Does this heuristic only apply if its a standalone advertisement?

That would cut out bananas, mangos, avocados, pistachios, every mainstream meat, eggs, dairy and water (both bottled and tap).

Right, supermarkets are necessarily not selling the product as much as their brand. The message here is - 'Come to our store, we have all these products at discounted prices'.