Actually, it also crashes on Google Pixel Phones. In fact, further down the Twitter thread, it is an issue in Android itself involving the Skia library incorrectly processing the wallpaper.
A Reddit video shows a "hKtweaks was granted Superuser rights" message immediately following loading the screenshot, so it seems like maybe someone stumbled into an RCE for some image processer that is actively being exploited and trying to elevate privileges? Maybe the guy who took the video is using a custom ROM?
For some reason, many people tested it on their own phones, and were sad when it crashed them, according to the twitter thread. Not sure what to say. lol.