Maybe, but if what the Navy pilots have described is our tech, and the UFO's that shut down the nukes was our tech, why would we be persayfooting around right now with Putin.
I think the biggest reason that they are afraid of UFO disclosure is that they really have no idea what is going on, and they know the public will panic if the government admits that UFO's are real, but that's basically all they know about it after 70+ years of study.