It's encryption, but not end-to-end. My understanding is, to be E2E encrypted, the keys must only be known by you and the actual other user you're communicatin

It's encryption, but not end-to-end. My understanding is, to be E2E encrypted, the keys must only be known by you and the actual other user you're communicating with. With https, this is not the case: you're only communicating with the server, which then relays the messages. However, the server can see everything. You can use the term in different contexts, depending on what you consider the "ends": If you think of your machine as one end and the server as the other, it is technically E2E encrypted. But in the more meaningful sense where your device is one end and your communication partner's device is the other end, it is not.