Yes, I think you’re right, that’s probably what they were going for.

So Swedish meatballs is served with “brunsås” (literally “brown sauce”) which is a gravy or roux made from the leftover fat in the pan after you’re done cooking the meatballs. I’ve never seen anyone do a white roux for meatballs. This is then served with boiled potatoes, lingonberry jam, pickled cucumber and often steamed carrots.

The gravy is however never served on a meatball sandwich! That’s a completely different thing. Another user mentioned that it’s supposed to come with a beetroot salad, which I’m personally not a fan of, but it would be weird if a “Swedish Meatball Sandwich” was anything other than that.

In general though I’m fine with people taking creative liberties with food, but you’ll have to put some heart into it.