He doesn't care about social issues but he promises to appoint judges to the Supreme Court who do.
People don't care about what candidates promise to do, they care about how they promise to do it. Trump doesn't talk like he cares about social issues, so people are not bothered by it, even if he will appoint more right wing judges. The only "social" issue Trump talks about like a "social conservative" is immigration, on which lots of whites agree with him.
Accept Trump hasn't said how he'd do anything. Since there has never been an obviously ridiculously candidate like Trump nominated as a major party candidate before, we don't know how people in aggregate will end up judging him.
However, the idea that a pro-choice voter would support Trump because he doesn't talk about social issues but has promised (and named) people who he would appoint to the Supreme Court who are presumably all anti-abortion seems ridiculous to me.
I personally think the lyric of Billy Bragg from Levi Stubbs' Tears is how this will play out "When the world falls apart, some things stay in place."