According to a screenshot from the video, caught by Tweaktown.com, the CPU was running at 5.2GHz with LN2 cooling and at a rather high 1.875V.
According to details, the CPU held through the Cinebench R15 test at -200C, hitting a score of 2449 points, which was enough to break the previous world record set at 2410.
It appears that AMD's Ryzen SKUs are also quite overclocking-friendly and if this is a hint of things to come, we are certainly looking forward to some official overclocking feats from the usual suspects.