I'm not sure.
Isn't the first rocket or airplane also built on simple technologies?
I'm not saying that the first rocket and first airplane falsified Gall's Law. I'm saying that, had the space shuttle, in the form in which it was actually built, been the first rocket or the first airplane, it would have falsified Gall's Law.
Suppose a hyperintelligent alien race did build a space shuttle equivalent as their first space-capable craft, and then went on to build interplanetary and interstellar craft.
Alien 1: The [interstellar craft, driven by multiple methods of propulsion and myriad components] disproves Gall's Law.
Alien 2: Not at all. [Craft] is a simple extension of well-developed principles like the space shuttle and the light sail.
You can simply define a "working simple system" as whatever you can make work, making that a pure tautology.
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