I don't think you could make a case for this being incitement. We only have a limited part of what he said, but from my understanding he is not telling people it is okay to rape anyone. I'd expect that he still considers rape a sin (although, in his twisted, medieval morality it probably ranks as a lesser sin than having an abortion).
Rather, he is putting across that view that it would be churlish for a woman to complain about being raped after having an abortion. After all, she's made it clear that it's okay to abuse her body by doing so herself, God's will be damned. The argument is in some way akin to 'it's her own fault for wearing a short skirt'. It's not an enouragement to rape, but a declaration that 'she brought it on herself'.
So, abhorrent, but not illegal.
Incidentally, incitement is no longer a crime a Britain, having been replaced with a new, statutory offence of 'encouraging or assisting an offence'.