It's stated pages later that Broly is now concentrating too much energy. Him surviving is due to his durability and nothing else.As such, since saying that a characters durability is infinite is usually an enormous outlier, surviving a singularity can extremely seldom be taken as a durability feat. It can only be understood as a feat for resistance against black holes.
That's never actually stated in the chapter. It just says he went on to destroy the universe. Even if it was, Destructive Capacity is not a limiter to Attack Potency.but him scaling to High 3-A in AP would be a pretty big outlier because according to his profile, it took him almost 8 years to destroy the entire universe.
He can also trade blows with Vegito, who is capable of harming him.destroying it I don´t know if is high 3-A AP
This is what the dbm wiki says about LSSJBroly has been shown being knocked out, so either all of the characters in the verse are High 3-A in AP or Broly has some resistance. Broly would realistically scale to the other characters in AP, but him scaling to High 3-A in AP would be a pretty big outlier because according to his profile, it took him almost 8 years to destroy the entire universe. Probably just resistance to black holes