NOOSE is not closed, it is merely in a form of development.
It has been decided that NOOSE will be "opened/setup" after the LCPD setup is complete and it will be made up of only the best of the best candidates at a later point in time.
I am best of best.
In regards to the vehicles:
Why not just release them when Noose is ready?
Why to remove:
New players usually get in them in the masses and this can cause flooding, they will also get frustrated and so do regulars when there are these cars available but you cannot use.
They will be useless until NOOSE is released - will not be soon.
Just need to put the script part with NOOSE vehicle in comment then release comment when its time to put them back

... No?.
Dear developers, please consider my points.