For those who are confused about ultimate Peter. That universe is an alternate ultimate universe were Peter never died. At least presumably it is an alternate ultimate universe. We still don't know what happened to the original ultimate Peter and Ultimates after Secret Wars. Also 616 and ultimate universes are still one.
Its another ultimate universe, where peter survived the shot from punisher and the sinister six, and its also a universe where secret wars did not happen.
He came back to life long after that event, but died again during secret wars when his universe was destroyed. So I guess this universe is back outta no where.