Well, as you likely know, Trump released a fake "transcript" of the conversation, while the true transcript remains hidden on a "codeword" server

There's a "true" transcript somewhere different from the one that was released, huh? Gonna need a link to the source on that one, chief.

classified at the highest levels (despite the lack of national security relevance) in order to protect Trump from embarrassment.

As for your theatrical hyperventilating about classification, why is it a problem that the President of the United States's one-on-one communications with foreign leaders are classified? That seems to me like exactly the sort of thing that should be classified.