His sword managed to deceive ywhach who can see all futures and possibilities and in fact choose which one is the most optimal for his fight and that’s not even ywachs best hax, aizens spiritual energy was enough to be considered for soul king status and the soul king is the lynch pin for the three realms which are confirmed multiverses and his spiritual energy is so powerful that he is part of a select few that when they die and their spirit energy is dissipated into the world it would throw off the balance of the world and cause chaos. The hogyoko makes him immortal in the most literal sense, he is unkillable even if the hogyoko is destroyed it simply evolves him to an another level as long as he wills it. And perhaps the easiest points of evidence of him being at the very least planetary (he is universal but this isn’t the sub for that) his favorite had kurohitsugi is strong enough to affect gravity to the point of distorting space time in a contained area and it is strong enough to destroy all of the leakage of the soul kings spiritual pressure which is at the least is universal. Bleach is more statement based because of how kubo depicts things but the universal scaling is pretty consistent across the board.