The Privacy Act - a Vacuum of Understanding Favourites include workers being required to complete a form on a one-off basis which includes a declaration that they have not been at a place of interest even though the list can be updated several times a day.
Latest cab off the rank is "you've been at a place of interest? Then self-isolate for X days" and they are saying it irrespective of what MoH may be saying about the very same potential exposure situation.
As to your query @MattD2, whilst we may choose to release our info to our own paymasters, one might say we at least have a bit of an eye on one's own organisation so as to be comfortable. If however that info is being sought by customers of one's employer and is released then one might say the genie is out of the bottle and control of certain personal info lost forever.
For anyone curious I'd thoroughly recommend the good e-learning training offered by of all people The Privacy Commissioner. Privacy and Health 101's and ABCs too for those who are keen. Nevermind the ten commandments or the seven deadly sins, one can get to grips with the Thirteen Principles of Privacy ;-)