It is still nessecary , it only works because both domains are serviced by the same CDN servers which ignores the plain text version once the packet reaches the

It is still nessecary , it only works because both domains are serviced by the same CDN servers which ignores the plain text version once the packet reaches them. If the plain text component is not there none of the intermediary parties will know where to route the packet as they cannot decrypt the header.