He’s referring to the AIS tracking system and how long until it stopped broadcasting after the boat whipped around due to the storm. You can look up the AIS and see it yourself too. Both this boat and the one anchored next to it whip around drastically the same time then the Bayesian stoops transmitting, likely because the transmitter is now under water. This video has a timelapse of the AIS https://youtu.be/yF5UduROOFY