Read it properly... "Sonia (name changed), a poor Indian woman, is now carrying their baby in her womb. The embryo was created in Dr Patel's laboratory with Jennifer's eggs and Kendall's sperm."
They are not talking about artificial insemination. The child will still be the couples biological child.
And its not that they pick up some random woman & make her a surrogate mother. And obviously, all the pros n cons are explained to the parties involved.