The change from access=restricted to access=yes, according to https://www.nationalparks.nsw.gov.au/visit-a-park/parks/macquarie-marshes-nature-reserve

> Recognised for its important wetlands, access to this nature reserve is limited to management and research staff, and there are no visitor facilities.

They mention some guided tours but if access is only to management and research staff or those on guided tours, I think we may need something stricter than access=yes.

The previous access=restricted isn't a documented tag value, but I guess it's okay. It could also be access=private.