There's a difference between time not passing and not existing. To a photon, space (in the direction of its movement) doesn't exist, as its origin and destination points are the same. But time does not pass - the axis of time is there, but the photon never budges in either direction, like a rock buried in the middle of the desert doesn't move in any spatial direction on a human timescale. The photon's beginning and end aren't simultaneous, quite the opposite. Since it can't move in time, they might as well be infinitely far apart.