It's impossible to point out till what block he was the only or one of the very few miners. With how much attention is pointed at the addresses the coin rewards were sent to, they will likely never move, and that's better for everyone.
It's very safe to say that large scale investors have applications running monitoring these ancient addresses, where the slightest movement may trigger a major selloff causing a flash crash.
Yes. It doesnt matter. He owns it and he worked for it. He didnt get it for free.
What if you are on the same boat as him and one of the first miners. Would you really want people to be peeking on your accouny or spying at you?
You owned it, you worked for it then you get your payment gor the hard work. Simple as that.
Why should we still dig this out?
I hope it is for a better information only.