This seems to be the relevant Two Minute Papers with a very quick explainer. https://m.youtube.com/watch?v=VOORiyip4_c
Even the title of the video is straight up clickbait ("The Worst Bug In Games Is Now Gone Forever") since the context is all wrong, the metrics on the top left even shows "time/frame: 3.38 min", how could that be useful for games? The problem with physics in games is in real-time simulations, not in cached/animated "physics".
Don't get me wrong, the simulations are impressive, and hopefully will have a big impact on simulation stability for real-time and not, I was just taken aback by the video.