Does this make any sense?
Yes.
First they define pregnancy to start before conception.
That's not what's happening. This is a statistical math problem and the last, reliably known variable is most likely the last period of the person before conception. That doesn't mean they were pregnant before conception. If neither the date of the last period nor the date of conception are known, they use a different method, probably ultrasound picture comparisons, and add a lower number.
The only pope who probably would have had a chance to comment meaningfully on this development would have been his predecessor Francis, a Jesuit - they are the guys who desperately try to believe in the big man and the scientific method at the same time. He was relatively more at ease with modern tech. He was also old an infirm before he was recalled, which is the time when OpenAI burst onto the scene. This new guy is from a less science-minded order of Catholicism. So it isn't that surprising that he is sceptical in public about it and we maybe didn't hear that much about it from his predecessors.