@feld the claim of them using the same E2EE with communicating to the server is laughable.
They most likely use TLS like every other sane person.
In fact using TLS for secret chats would be a much smarter idea in the first place rather than rolling their own crypto which is known in the industry to be a failure only the most inept security engineers do.
Every crypto is insecure unless shown otherwise.
AES, GPG, EC, … have been spotless since decades and that's why they're trusted