> What's fascinating in itself though is that no person, however sceptical, can immediately rule out the possibility that stuff like this is some form of life or even evidence of non-human technology.
You can never completely rule out that possibility, regardless of how much evidence you collect, but it's a matter of semantics at that point. Immediately and without collecting anymore data, we can dismiss the hypothesis that this is non-human technology as unworthy of our attention. It's not merely that the hypothesis has an immense burden of evidence to heft, but that it's a waste of time to even consider it.
Seeing possible evidence of extraterrestrial life in every unexpected observation is nothing more than a superstition.