Beyond frustrating because I'm experiencing this too in Xcode 12.0.1, this still has yet to be resolved. Even when I remove the dependency from the project and delete the DerivedData folder, Xcode is checking out these old repositories every time I open my project.
Sumthing
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https://developer.apple.com/documentation/devicecheck/dcappattestservice/3573915-issupported
If you read isSupported from an app running on a Mac device, the value is always false. This includes Mac Catalyst apps, and iOS or iPadOS apps running on Apple silicon.
So it appears it's just not supported on any Mac devices yet, despite the DCAppAttestService class being available in macOS Big Sur.
I agree with you, the documentation needs to be updated to explicitly note that Mac devices have yet to support the actual service.