Are metafieldDefinitionPin arguments correct in API docs?

[pepsimax2k]

https://shopify.dev/docs/api/admin-graphql/unstable/mutations/metafielddefinitionpin

Shows identifier as only argument, and definitionId as deprecated. Yet, the code example shows definitionId, and trying to use identifier gives the below errors. So err... are the docs wrong? Did someone tag the wrong argument as deprecated?

   "message": "Field 'metafieldDefinitionPin' is missing required arguments: definitionId",

"message": "Field 'metafieldDefinitionPin' doesn't accept argument 'identifier'",

{% action "shopify" %}

  mutation {

    metafieldDefinitionPin (
      identifier: {
         namespace: "MY_NAMESPACE",

          key: "MY_KEY",

          ownerType: PRODUCTVARIANT
      }
   ) {

      pinnedDefinition {

        name

        key

        namespace

        pinnedPosition

      }

    }

  }

{% endaction %}