It is an interesting video. My main takeaway was that we burn the same amount of calories regardless of activity, but when we are sedentary our body uses the calories for evil (inflammatory) purposes.
Well inflammation is a bit overblown as to how bad it is, it is literally required for muscle gain, so those people doing cold plunges are literally killing their gains as they say.
But yeah interesting video, I do wonder if the prevalence of anxiety and depression is more due us having access to way more calories than needed and doing way less exercise than needed and our brains going into overdrive rather than due to mental health awareness