High frame rate in low light is not a good idea - this is in a way a worst possible case video. I would have been interested to see 2.7K 25fps with horizon lock on. That would give it more of a chance to lower the shutter speed and to avoid the seasick lurching of the camera.
Hello there Tide. Good day and thank you for posting this interesting review video you have came upon. To learn more about the new DJI Action 2 I will post a DJI link where in you can find the specifications and frequently asked question for the DJI Action 2 ( https://www.dji.com/dji-action-2?site=brandsite&from=nav ) Again, thank you for your support and have a nice day.