If you have not read Zacharia Sitchin's 12th planet series, it is quite compelling.
But I think from the Sethian point-of-view this would all fall under probability. There is no government conspiracy unless you believe there is a government conspiracy. There are no UFOs unless you believe there are UFOs. But it is probable that UFOs and conspiracies do exist. If you have experienced them then you have selected that probability and integrated it into your daily life. Remember, from moment to moment we are experiencing probabilities that we are selecting from a wide spectrum of possible realities.
A Seth quote comes to mind. It is actually Seth quoting Jane who said...
Fact is officialized fiction. So we are the official representation of our fictionalized self.
Seth does mention an ancient race that tried to suppress desire and failed. Then later bred with the primitives. Which sounds a lot like where Ma-ah (from Oversoul Seven) lived.