It is a complicated mess.
There are real aliens with real technology—some of whom have been on this planet longer than we have.
There is human technology that is kept highly compartmentalized and top secret—some of which is reverse engineered alien technology and some of which is human technology.
Then there are psyops to keep the secrets and keep the peons dumbed down as much as possible.
The biggest mistake I see Freepers (and most others make) is that they do not understand that modern science is handicapped by national security state secrecy/compartmentalization as well as disinformation techniques designed to cause mass confusion.
Are these our leaders? Do they look like humans? Are they in control?