This is the Catholic Santorum, not Mitt Romney.
“I was basically pro-choice all my life, until I ran for Congress,” he said.
In a December 1995 Philadelphia Magazine article Santorum said as much:
Santorum does concede that he’s had a volte-face on abortion. “I was basically pro-choice all my life, until I ran for Congress,” he said. “But it had never been something I thought about.”
“So why did you change?” I asked.
“I sat down and read the literature. Scientific literature.”
“So religion had nothing to do with it?”
“Oh, well, of course,” he said, “And religion too. It was both of those, science and religion.”
From your source:
“Abortion is such a deeply wrenching issue because it poses a conflict between essential values. The unborn child’s very life is at stake;”
Thanks for confirming that even in 1990 - Santorum believed that abortion kills an unborn child.
If this is all the evidence that you have, then I can only confirm that your claim is false. Santorum affirms the humanity of the unborn.