My understanding is that their particular strain of stem cells came from an unused frozen embryo, not an aborted baby.
This is from a third party I know who is invested in this company. I mentioned my disdain for the embryonic lines from aborted babies and the lack of progress with them, and he mentioned he'd looked into it and what he'd discovered as a result.
They took one cell from the embryo, and left it otherwise intact.
It may be splitting hairs, since the embryo itself may have been (or may still be) viable, but sits (or at least sat) unwanted for now.