No. What is meant here is that whenever multiple DNS resolvers are configured on a particular DNS client, those resolvers should share an identical view of the

No. What is meant here is that whenever multiple DNS resolvers are configured on a particular DNS client, those resolvers should share an identical view of the DNS landscape for that client to consume. If you have an internal DNS resolver which handles some private DNS entries, you should not set up any client with that resolver AND a second resolver which does not also have those entries. So what the OP it's saying is that the example you provided is something you should never do. So to clarify the statement: "all DNS resolvers defined on a given client are expected to return the same results"