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Re:iOS now requires Sign On with Apple alongside other auth ... by untog on Saturday March 07, 2020 @08:46PM (#22515706)
That’s covered by the first bullet the OP posted:

- Your app exclusively uses your company’s own account setup and sign-in systems.

Re:iOS now requires Sign On with Apple alongside other auth ... by JoshTriplett on Saturday March 07, 2020 @08:51PM (#22515747)
It wasn't obvious from the quote what the alternative case was.