Not true! I’m using Sparkling theme + Jetpack enabled and Infinite Scroll is not working. Besides, even your demo page doesn’t have infinite scroll.
Previously, with WP’s Fifteen Theme everything worked, but now with Sparkling, instead of an infinite scroll there’s a “Load more posts” button. Infinite scroll works when a visitor is scrolling and the next posts are automatically loaded, no buttons/clicks involved.
I already changed “click” method to “scroll” inside jetpack.php without any luck. Can you provide an answer similar to the one you gave to Tavelify theme but now for the Sparkling theme?
So the question persists: “how to enable infinite scroll for Sparkling theme?”