No, think of the following scenario: you and your friend know that you want to communicate in the future about something, maybe the outcome of some future event

No, think of the following scenario: you and your friend know that you want to communicate in the future about something, maybe the outcome of some future event. You generate a long random key, and somewhere later in the future, you send the information using the pre-shared key. It's a real encryption, much-much better than basically anything before because it's really unbreakable.