I think this kind of symbolism is just very liked by a lot of people in the industry - simply because they know it's "mystic" and "dark". Also a lot of people like to make illuminati refrences just because they think it's cool.
The MK Ultra thing doesn't even make sense. The program ended in the 70's. Unless Ayu was a newborn back then - but I don't think the US experimented with her when she was a week old after her parents let the US military take care of her at Okinawa.
The videos were fun to watch, but a little bit too much Dan Brown style.