We have to assume he is alive based on the recent interviews. I understand some peoples concerns with regards to the possibility of the videos being fake but most people would say that is absolute pie in the sky nonsense and i tend to agree for the moment, even with everything thats came out about clinton and pizzagate i think that level of deception seems too crazy to be true. All we can do is wait for the next leak, if it is truly incriminating stuff against clinton, the cia, the fbi, or any other important establishment structure i think its safe to assume the cia arent behind it. If its a powderpuff leak with no really damning evidence I'll be very skeptical of assanges whereabouts.