If:
(a) the act attributable to the Commonwealth contains a reservation or condition for the benefit of Aboriginal peoples or Torres Strait Islanders; or
(b) the doing of the act would affect rights or interests (other than native title rights and interests) of Aboriginal peoples or Torres Strait Islanders (whether arising under legislation, at common law or in equity and whether or not rights of usage);
nothing in section 15 affects that reservation or condition or those rights or interests.