They are not pro-life. If they were pro-life they would work to make life good/ better for those who they insist birth children and for those who they should be born.
They are pro-slavery, Forcing/ coercing women to be incubators against their will is sexual slavery. They refuse to consider women as equal human beings with equal rights to men, and seek to diminsh women's independence by forcing on her (and only her, men are not held accountable) to the unwanted burden of gestating, birthing, and caring for children, even at the cosf of her physical and mental well-being.
Their call of "fetal personhood" is a tool to emotionally manipulate people ("won't you think of the children?"), while they deny actual living persons their personhood. All their actions & words are geared towards dehumanizing women.
Tellingly, they also are not against child labour ("wont you think of the billionaire's profits?"), once a child is born. Their goal is to deny women their personhood, bind women to sexual slavery, and ensure the wealthy have a supply of cheap & easily available labour.