Let's turn that around for a moment. Suppose you come across a herd of Taiwanese glow-in-the-dark pigs. Your task is to explain them. I'll challenge you to come up with a testable, falsifiable evolutionary argument for their origin.
Now, as it happens, we know the real explanation is that people did genetic engineering to make the pigs that way, by adding jellyfish DNA to the pig genome. This is an example of intelligent design, obviously.
A bit of imagination suggests that the test for it would involve sequencing the genome, isolating and identifying the imposed difference, and asking a simple question: how could it have gotten there? You've supposedly come up with your evolutionary hypotheses; and we can obviously also propose an ID hypothesis. Which is the most likely to have occurred?
Also, let me know how we can use it to predict the results of experiments with it.
I'm rather certain that the folks who invented the Taiwanese glow-in-the-dark pigs were rather specific in their intent: their design goals are their predictions. So this complaint fails miserably.