His argument also ignores that the Didache is very clear in its condemnation of abortion and birth control. Is this man suggesting that those who wrote the Didache who were contemporaries ( if I remember rightly) of the Gospel writers would have written or preached something that contradicted what Jesus had passed on to His Church through the Apostles?. Why would they witness against abortion if Jesus and the Apostles were neuteral on the subject?
But I don't think that would matter to them anyway. To believe the teachings of the Apostles' are infallible you would have to believe that Scripture is infallible and without error. I bet NCC holds no such belief.
So what does it matter what any writing on Christian morality says. What matters to them is celebrating sin and degradation and sending more lost souls on the way to hell.