It’s more a question of people in a building knowing who their neighbours are than any intrusion into anyone’s privacy. In NSW, this is compulsory, with fines potentially attached for failure to do so. In SA, the standard “articles” (by-laws) say:
12 A unit holder must immediately notify the strata corporation of—
(a) any change in the ownership of the unit, or any change in the address of an owner;
(b) any change in the occupancy of the unit.
I don’t think that simply means you have to tell them you have a new tenant. You should let them know the tenant’s name and contact details in case they need to be contacted for maintenance, in an emergency or if there is any problem that affects them or is caused by them.
There is a very detailed handbook on SA strata law available for download HERE.
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