The interpretation of the data is wrong, but it is the same misinterpretation that is mainstream in the catastrophic climate-change literature.
I watched a snippet of the Joe Rogan podcast sometime ago and Joe Rogan's exclamation at the end of the segment went something like "wow, that is the real inconvenient truth". The hypothesis is tied to the historic delta-O-18 [1] data that is best captured by the LR04 Benthic Stack [2] and fully corroborated by other data sources like Greenland/Antarctic ice cores, and cave stalactites.
The problem is that the delta-O-18 data is often represented as a delta-temperature proxy. It is a common mistake to assume this is real temperature, it is not. The best way to think of the value is that it represents the amount of fresh water trapped terrestrially. The event in the historical data set represents the sudden release of the glacial meltwater trapped in the North American Great Lakes / St. Lawrence River basin. It is fully expected and does not represent a sudden change in temperature. There are also many predictions that can be made based on the event being tied to a sudden influx of fresh water into the Atlantic via the St. Lawrence river.