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check method in Dynamic Provider accepts as params oldOutputs: MyResourceProviderOutputs, newInputs: MyResourceProviderInputs as diff method?

No - `check` gets passed "old inputs" and "new inputs", whereas `diff` gets passed "old outputs" and "new checked inputs" (the inputs returned from `check`).

See <https://pulumi.io/reference/programming-model/#dynamicproviders>, and in particular <https://pulumi.io/reference/programming-model/#check-olds-news> and <https://pulumi.io/reference/programming-model/#diff-id-olds-news>.

Oh, right, it is described there! I was looking at it and couldn't see, thanks Luke!