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As for the rest I think scholars today are way too arrogant and label ancient cultures as too "primitive" to have advanced technology. There are always people who are way a head of their time, like Da Vinci or Tesla. It's whether or not the rest of the people are smart enough to listen to their ideas.
#6 this one is not much of an illusion to me. as in, if you can make a paper airplane today, you could have made one many thousands of years ago out of various materials. from there, all one needs is the imagination to conceive a larger model that could carry a person. even if they never actually flew, ancient peoples could have made such models many times across history.
#11 what happened to the technology? one theory is that the inventor was killed by the romans IIRC. his name was archimedes of syracuse.