Seasoning is not included in this I think. It’s only stuff like strawberries, banana and whatever people put in their oatmeal, idk, I don’t eat it. So actual other foods. I.e. a chicken breast by itself is a percectly fine food, a strawberry is as well.
But yeah I mean it’s meant to be a joke, like you say, things taste better/different together, or only taste good if mixed with something, and that’s perfectly fine.