Earlier quoted context omitted.
Nothing from the Bible indicates that hell is empty, so that is indeed an interesting response from the Pope.
The bible only has sparse and often contradictory references to hell - so it's very difficult to state "what the Bible says about hell" as if there's a unified picture laid out.
I've always just assumed the descriptions that work to keep people fearful of leaving the religion as whatever is used at the time (saying this as somebody who is agnostic).