An Australian court ordered Apple to open up iOS app distribution. The order is a legal event in one country, not a worldwide App Store rewrite. That is the narrow version of Australia Apple app distribution.
The person this changes first is a developer who ships in Australia and has been waiting on sideload rules. Apple is who the reporting names, and that is not a claim about every rival in the same market.
I am not adding a result the report did not state. A pilot, a pledge, a filing, and a product you can buy are different events, and Australia Apple app distribution is only as far as the first sentence.
If this touches something you use this week, act on the opening fact. If a later note from Apple disagrees, keep that one.