They take a little while to load once you click on them; it's dozens and dozens of files.
The data for the embeds may still exist on Lytro's CDN, if you know the UUID for the image, and could be rescued and rehosted. After they shut their hosting service down last year, I crawled every embed the Internet Archive had, and downloaded the additional JSON and JPEG assets necessary to restore the embeds. https://www.archiveteam.org/index.php?title=Lytro