I believe we are in agreement. If you are a communication platform that implements e2ee then you provide the guarantee to users, backed by security researchers, that the government can't read their communications by getting a subpoena from the communication platform.

The problem with AI platforms is that they are also a party to the communication, therefore they can indeed be forced to reveal chats, and therefore it's not e2ee because defining e2ee that way would render the term without distinction.