The problem is the Lds church then in its 1973 statement for abortion allowed for exceptions; and continued to expand those exceptions as time went along! Even Lds scholar Richard Bushman admitted as much:
Mormon scholar Richard Bushman: There was a moment in the late 1980s when the church came down with an absolute no on abortion. And then very quickly it moderated – look, the health of the mother has to be taken into account; all sorts of other things.
Source: Mormonism and Democratic Politics: Are They Compatible? (May 14, 2007) – for transcript see: Mormonism and Democratic Politics: Are They Compatible?