On 12/6/21 06:53, Jakub Sokołowski via GNU coreutils Bug Reports wrote:
> I've identified an issue with GNU Coreutils uname utility. Specifically
> with the value it returns for the processor type/architecture(-p). When
> used on a MacOS with M1 arm64 processor the returned value is amr64, but
> the default uname utility on MacOS returns arm.

Does the attached patch fix things for you? Unfortunately I don't have 
access to macOS to test it.