**UPDATED***
For anyone still looking, I found a workaround for autoplaying a Summary Carousel Block. It autoclicks the next button every three seconds.
Inject this is Settings > Advanced > Code Injection > Footer
<script>
window.onload = function() {
var nextArrow = document.querySelector(".summary-carousel-pager-next");
function clickNext() {
nextArrow.click();
}
setInterval(clickNext, 3000);
};
</script>
I updated this code to remove the use of JQuery (for page speed reasons) as well as to help with the refresh timeframe.