We can not change other people, we can only change ourselves.
Until/unless he changes and is truly willing to change the hoarding behavour he will not change.
Moving stuff around, rearranging it is called "churning", a way a hoarder will try to organize the hoard.
You can not organize a hoard.
He gets angry when you try to declutter. This is very common.
Unless he wants to change he will fight you every day to keep all his "stuff" just the way he wants it.
Read here about how children living with a hoarding parent feel.children of hoarders
A great book for you to read is "Digging Out".
He really must agree to therapy for the hoarding.
Good luck and best wishes. :)