It depends on what kind of reset/rebirth the conversion to full Ramp represents.
And also whether the curse moves laterally before vertically. Being a newborn Ramp may have made her sibling for a brief window to all fetal Ramps.
JB was clear that the Reds, unless somewhere the curse couldn't touch them, were gone, and the half-ramps were de-halved, with those who would still be alive as mortals surviving. Instead of arguing that the author is wrong given an interpretation, maybe look for the interpretation that matches the author's statement on the matter.