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Comment from stefan 6.2.1 Live Region Properties and How to Use Them - aria-busy is listed here whereas it is NOT explicitly a live region property according to ARIA spec (section 5.2.5 Required Owned Elements). It can, but needs not exclusively, be used within this context. For instance, you update a part of UI you don't want ever to be a live region (e.g. data fetching/repopulating parts of dynamic lists). Here, aria-busy also comes in handy. There is a lack of examples for that in the APG.
part of https://github.com/w3c/aria-practices/issues/78