Unless they did not do it how we would do it. My whole point is the tech is interdependent don't have the wheel don't get the pulley etc. The new world did not apply the wheel but somehow figured out road building irrigation running water etc. So if I see a paved road should I assume wheels? In a similar way aliens visiting only tells us they can visit. It implies a lot of stuff but it only tells us one thing. There seems to be lot of projection in what you have written. I partially cede that some tech may be inferred but only in a general sense we know nothing about their physical requirements or limits. We don't even know that mathematics is the only way to arrive at tech. (actually if you look at the history of the jet engine it does not seem to be true) As for moral and ethical "advances" I assume you agree that can not be inferred at all.