If you wanted to get a list of Shourd’s mods, you would need Shroud to go through your apps OAuth flow, with the moderation:read scope, to grant you an access token that you can use to get the list of mods for his channel.
It’s the same for endpoints such as Get Broadcaster Subscriptions, you need the broadcaster themselves to grant you access to that data, you can’t use a token from your channel to access someone elses data that’s behind a scope.