Thats a live photo. He probably created his own file by piecing together the needed components to match the default live photo implementation. It only works if you have a 6S or 6S+ because doing the live photo requires 3D Touch.
Yeah you'd have to make your own file or ask him for it. I don't know exactly how to do it though.Thanks for your response. I am using 6s here.
There's a thread here that tells you how to do it. Let me see if I can find it.
EDIT: here you go. Scroll all the way to the last post.
https://forums.macrumors.com/threads/live-wallpapers.1924141/