So why does the popes comment on this make sense to you.
Why, because they state the obvious: even taking for granted that Jesus is God and that there is an afterlife Heaven which is somehow barred from some people for whatever reason, no one should assume that disbelief is an obstacle.
It is not possible to believe that disbelief would be a factor without also believing that God is insane or grossly unfair. Which I guess is not an option for Christians.