I haven't read the article yet, unfortunately. If it talks about food plants, does it mean food plants for the larval/nymph stage of insects or for the adult stage? I think native insects would prefer native plants when they are larvae but I don't really think they would be too picky when it comes to flowers producing nectar, unless the flower is so extreme in its form that they can't reach the nectar.
Two thirds of my garden is wildflower meadow and it is bordered on two sides by huge clumps of 2-metre high nettles and fields cropped by sheep. Plenty of native plants around, but remarkably few butterflies and moths. Except for this afternoon when I was escorted down to the compost heap by six Small Tortoiseshells that fluttered round me for several minutes. Other than that, just the usual hordes of Small Cabbage Whites, a couple of Commas, a handful of Meadow Browns and one Red Admiral.
Other insect life is often more interesting. Burying beetles are quite common here. And crickets/grasshoppers.