So all of these people are liars then !?
You obviously haven't heard them, you are guessing.

"A lurid green tail dips down from an ash tree followed by an
ear-pulverising sqqquaarrrk!"

http://www.theguardian.com/environme...-parakeet-cull



Some people make a fuss about nothing. They make lovely noises.

These ones don't. You have obviously never heard a Green Necked
parrot's screech, otherwise you would agree.

I'm going to take it you mean a "Ring-Necked Parakeet" - like this,
which is a lovely sound, and quite comical, like a squeaky door or
someone polishing a window - https://youtu.be/Z27jgDIOE5w

Yes, Green Ring Necked Parakeets. That clip sounds nothing like them in
the wild when they are calling to each other.