Well its more like search and replace, where you cross your fingers that it only replaces the words you are trying replace without impacting the rest of the text in the document.
I don't have time for the overly polite fluff talk to the expense of practical and real communication. It is hard to be caring and direct. Being triggered by anything can be ptsd, and/or a self defense mechanism for incompetence, so it's important to work out what is going on in these cases. But yes, it is absolutely possible to be caring and gracious while still being direct when you exclude the people who will over react as a self defense mechanism as a result of valid or invalid reasons.
To call it lying is just arguing about the meanings of words. This is literally what lawyers are paid to do. The data payload can be called end to end encrypted. You can easily say to the user that "your emails are encrypted from end to end, they are encrypted before it leaves your computer and decrypted on the receivers computer" without talking about how your key server works.
Systems that incorporate a method to allow unlocking using multiple keys don't usually advertise the fact that this is happening. People may even be legally obligated to not tell you.