Yeah, sorry but I dropped my belief years ago... everyone has a cell phone with a camera, everyone uses youtube, there is rarely a moment when someone doesnt have a camera... yet when a UFO is reported, the best we can get are fuzzy lights in the sky. And why do UFOs only visit us at night? If it is to hide then their bright lights kind of give them away....
I don't know if UFOs are aliens or something else or nothing at all. However if these UFOs want to be seen (as the article claims) then they can be seen only at night. The sky is too bright at daytime, and it's hard to see a small craft that is flying high.
At night a moving light source stands out and will be easily detected, but not photographed in detail because of small size of the light source (the craft may be larger, but it's dark.) There basically is no detail to photograph outside of the filament of the light bulb, or an arc in xenon, or whatever light source is used.
This particular event could be staged with four civilian helicopters, for example, flying high enough so that the sound is not heard. Bell 212, for instance, has ceiling of 17,000+ ft. - should be plenty to not be heard, especially if they are flying over an inaccessible terrain, so that there is nobody directly underneath.