I couldn't find the archived video on Twitch, but for those still interested you can find it on their YouTube channel. Here is a link to a video on their channel called "Unreal Tournament Art Direction": https://www.youtube.com/watch?v=AQ8Dabp4l7E&list=TLW0sr3ckbwa_ZpK7WJd1PXqtjCjhOf4wd