If your page was cached by the crawler than it may take up to 7 days for this to be refreshed as described in the troubleshooting information. I’m not certain that a GIF is permitted as an image type for cards, I almost always see PNG and JPG being used on other sites. An animated GIF like the one you’re linking to is certainly not going to work. If your intent is to provide some kind of animated content you should use a player card with a video stream URL.
