Presumably he is being inclusive about a relationship where two women are having a baby, one is the birthing partner and one is the non birthing partner. I suppose the non birthing female partner would be in the same position as this man. I suspect he was trying to avoid someone saying he was ignoring lesbian couples.
I think we need to think of what is best for the baby and I think the baby is entitled to have their surviving parent around for a year.
Having watched the video, I agree that he is being inclusive of lesbian couples.