It is more like this
client → relay node(s) → Client Managers (For Put)
client → relay node(s) → NAE Managers (for Post/Get)
So the relay is almost dumb and does not need to be able to understand what is happening, just pass on “stuff” to an address. In terms of what is readable then routing info minus IP and data (which on the network is encrypted) as well as signed requests to alter (Post) or plain Get requests.