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Yes. They are dead. Just like the folks who built Machu Picchu. The problem you refuse to face is that your fantasies are mortally wounded when one raises the fact that their tombs were found. And not a single trace of your alleged advanced technology was found with them or where they lived. Not a single bit of steel, vidia, copper wire, NiCd batteries, prosthetics, dental care, glass, etc. The people from their very elite had lots of dental problems!
Face it- You created this thread wishing for support to your World Peace Initiative MkII. The table was turned, the very foundations of your pet project were challenged, crippled, smashed, defeated, beaten, and blasted even when we played by your rules. You could not present a single coherent line of defense. You complained about not receiving serious feedback. This is not true, for you received it. Your points were countered by evidence and reasonings of the reliable kind. All you offered to counter the critics were fantasies about lost golden age civilizations and an alleged UFO sighting over which you built a messy space opera with more continuity problems than Star Trek. Oh, I forgot the "I am the truth" claims and the evangelist language.
I believe deep down you know all this stuff is not real and that you wasted and are still wasting time and energy on it. Time to let it go and grow.