Magisterium, in which the Pope has a preeminent position of influence...so, when he says that the Personhood of a fetus is "Debated", that has meaning above and beyond the CCC...so, you cannot just let that statement float away in the wind.
btw, read a little further in the CCC...to Notes 2307-9...i.e. the part covering "Just Wars"...everyone knows that 'Killing' is always a step in the wrong direction (a Sin), but yet, under certain conditions, it is accepted...so, with this logic in mind, it is reasonable to debate Pope Francis' comment on Personhood in the context of Abortion.
fyi...I'll be coming back to that in future posts...