He's referring to when Goku tried to Instant Transmission early in the DBS Anime, and when he went to search for a Ki scoured what looks like more than one galaxy before quitting, or-Like Topaz, used Vegeta's teleport as a baseline minimum distance (Vegeta crossed a Quadrant). Meaning that, logistically, if each teleport has a high end range, that Goku could potentially be teleporting a distance of several galaxies at a time before the full distance is reached. That said, I agree with it not being the Universe. He just traveled between two arbitrary points within it.
Edit: Nevermind, I stand corrected.