(1) If this Act requires or allows a Joint Authority to:
(a) give a notice; or
(b) communicate a matter;
the Designated Authority is to give the notice or communicate the matter.
(2) For the purposes of any proceedings, a notice that purports to be given by the Designated Authority is taken to have been given in accordance with a decision of the Joint Authority unless the contrary is proved.
(3) For the purposes of any proceedings, a communication that purports to be made by the Designated Authority is taken to have been made in accordance with a decision of the Joint Authority unless the contrary is proved.