I don’t know why it should be a thing of surprise in my opinion, i have always tried to stretch out that most of the bitcoin on dormant addresses are not lost coins but rather belongs to holders who are holding for a very long time and when this moves happens it is either for investor to actually take profit or even most often move to other wallet where for security reasons both of which shouldn’t be a thing of concern.
Let's say he used all his money to buy gold and didn't buy the 400 BTC. My estimate, based on prices 12 years ago, is that he would have only 12 kg of gold, and if he cashed it in today, it would be worth around US$1.6 million. If he cashed in his entire BTC holding, he would have around US$42–45 million.
A significant difference in ROI between GOLD VS BTC with a 12-year waiting period.