Almost all of that was an increase in stock price. That's about as close as you can get to just sitting in a vault. If he were selling it and using the money for something else, that would be one thing, but he's really not using much of it.
This is not to say it's his fault. That's how our laws are written. But that is the point of OP. That our policies should be forcing him to sell and put that money back into the economy.
Owning stock is the polar opposite of having money in a vault - it is giving money to the economy. Specifically to a part of the economy that is a money-generating machine: a company. Put in circulation precisely to be invested on the economy.
> Almost all of that was an increase in stock price. That's about as close as you can get to just sitting in a vault.
It would be at least as accurate to say it's as close as money can get to not existing at all. Policy should probably not be "forcing" people to realize gains that, in many cases (maybe not MS, but policy has to work for everyone), may as well be Monopoly money.