It has human DNA unique from the mother and, in this case, an independent heartbeat. To the minds of the people supporting this law, that makes it alive, with its own rights independent of the mother's.
Their argument, as such, is that it isnt a matter of reproductive healthcare at all, but murder. I know of a few states that would file multiple murder charges in the case of killing a pregnant woman, for example.
All the comparisons to a handmaidens tale, yelling about womens rights and reporductive health will never change their mind... No different than the accusations of Larry Elder being a white supremacist.