how exactly can they definitely rule out bugs and or birds.

which is exactly what it looks like.

And how the fuck did they trick the expert into saying its not birds.

They clearly wanted to put out a sensationalistic news story to get ppl interested and they wanted it a UFO mystery.
The video footage is edited to fuck, so you cant even tell what objects they are referring to. The statements put out by the FAA and NORAD are textbook standard replies they give when they basically want to say, shut up and go back to sleep.

once again, why is bird or insect ruled out when that's what it looks like?

I dont even need your answers, the answer is to make people talk and argue about it, to boost the news stations viewing figures.