LGTM as far as the description of the service and security goes.
You could possibly mention that the 12-character "quick link" is using a 0-knowledge transfer of data method, avoiding key disclosure.
In detail: to transfer the account credentials and secret key it uses a protocol called
J-PAKE, which prevents any system except the sending and receiving one from being able to learn the contents of the transferred data (the J-PAKE server never knows what data is being transferred because it is end-to-end encrypted, and the server just hands over encrypted data blobs from one to another).