Probably because it’s a very rough calculation. He talks about dividing 100-300 trillion by 20 million. The extra million wouldn’t make much difference in his Jan 2009 prediction guesstimate of $10 million per coin.

I still believe Hal was Satoshi. My number 1

Maybe because there will never be 21 million.

Just makes the math simpler

Always knew satoshi’s million coins would never hit the market?