Not sure about those tests, but TDP is 280W, usage a bit lower. See https://www.computerbase.de/2020-02/amd-ryzen-threadripper-3... for that and https://www.computerbase.de/2020-02/amd-ryzen-threadripper-3... for temps, note that this review used a Kraken X62.

That energy usage is below the specified TDP is surprising. Some other recent processors - especially from Intel, but to a lesser extreme also some AMD models - happily went way above their specifications.