I agree with David on this. He starts with a false position and then tries to defend it. Limbo has never ever been considered more than a theological opinion. Why? Because Divine Revelation is silent on the matter of what happens to those who die, without the stain of personal sin, but remain in the state of original sin. Limbo is one possible answer. It isn't the only one, and there just isn't enough information from the Deposit of Faith for us humans to deduce the final destination of these human beings.
Me personally I lean towards the idea of limbo, but again, I'm not going to run around saying that limbo is fact, it is just really an educated opinion on the matter.
I do like that he points out a simple fact in the interview, that the term "hell", is heavily misused in today's language, even among theologians, apologists, and others who should know better. Hell is not the lake of fire. Christ named this place, one would assume from His description, Gehenna. Hell is Latin for Hades, which is Greek for Sheol. Sheol is simply the Hebrew word for grave. So hell is really the state of being dead, whether it is truly a place or not, is questionable, as those in hell are spirits, and we are not sure that spacial location is a spiritual property.