I salute and give my respect to #bitcoin visionaries and OG cryptographers like Mr.Halfin.
Note he wrote 1 day after Bitcoin protocol started running. It was 10th January 2009 
Discussion
Notice how he talked about 20m coins, not 21m.
Wasn't 21 million cap added later in process?
No it wasn't 🤣.
No, it was "set in stone" at the very first 0.1 release.
How much Satoshi mined for himself/themselves? 1 million?
It is estimated to be somewhere between 300k - 1.2m coins.
But I actually believe that Satoshi doesn't have and never had any private keys to adresses where coins were mined to.