I addressed the other two at https://news.ycombinator.com/item?id=46132220 .
You did show that the term was already used, but in the current meaning
That paper is about PKI-based session setup for End-End which is the ancestor of SSL/TLS. It even mentions a CAE which is effectively a CA and it does a synchronous handshake to establish a symmetric key. It's very clearly about transport layer security from end to end.
It's not about User-User E2EE (akin to Signal) and shares very little other than that data is encrypted from point A to point B.
Otherwise, you have two instances of encryption with decryption in the middle; that can't logically be called end-to-end encryption, I never heard it called so, and hopefully it never was.