Agreed, I am not saying that. I am saying its can be using the "compressed" time so that when it comes back to earth it is actually 50 years behind the current earth time. As in the probe is gone for 30 years but the earth has gone for 50 years making it 20 years in the past when it comes back to earth, but its all in the future relative to now.
There is no way according to physics laws that we know of for something to leave earth today and come back in the past like kotowboy was saying.