There are a couple references to auditing - the first reference seems like they do not do audits of suppliers of public companies they invest in, choosing to focus on engagement instead. The second reference is unclear how the administer those auditing processes -- and makes no reference to frequency (indicating it is not continuous monitoring).

Page 10:

"Engagement priorities include increased disclosure on how the business is addressing modern slavery risks, deeper understanding of the company supply chain beyond tier 1, and the development of supplier relationships beyond reliance on auditing activity."

Page 12:

"Compliance with key AustralianSuper polices through auditing processes."