I've now seen that this page has changed since asking this question yesterday: https://developer.apple.com/documentation/webkit/wkdownload
Yesterday it said macOS 12+ now it says macOS 11.3+.
E.g. From the Wayback machine https://web.archive.org/web/20210827192207/https://developer.apple.com/documentation/webkit/wkdownload
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For any iOS developers looking at this, it was previously marked iOS 14.5+ and seems to have been changed to iOS 15+
Also fixed in XCode 13.2 Beta 1 (released yesterday).
Will this be fixed in XCode 13.1 ?
Also seeing this with tvOS