It's either true, or he is lying. He gave congress a list of names of individuals to get further testimony from about all the various programs. That's a weird move if he is lying.
Also, people are going to make up their own line of demarcation on when the UFO's are real. If yours is a green man comes out of saucer and shakes your hand. That's fine. It's all completely legit to consider this "real" when a government employee who has confirmed been involved in the programs, gives testimony, and additional witnesses to verify his own testimony.