"build the concurrency library for back deployment'" - what does this merged request mean in practice?

Swift has accepted a pull request to 'Add an option to build the concurrency library for back deployment'

Can anyone explain what this means in practice for iOS/Mac dev?

Can I expect to be able to use async goodness when targeting earlier iOS/Mac builds -or will I be using PromiseKit for the next few years until my users upgrade?

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