No coins were premined; the newspaper headline in the genesis block serves the purpose of proving that.

As to the oft-stated-as-fact 1 million, it's not a fact, it's a theory, one that was hotly debated when sergio lerner came up with it. People should be a bit more cautious about spreading it as fact, because of the danger it brings to whoever the real Satoshi is. But, people being people, it has spread everywhere. 

 Satoshi had to have been a capitalist, no socialistic free open source software dev can think of Bitcoin. It is highly likely that he mined a lot of blocks in those first 2 years. Besides it doesn't make sense to build a software and not run it yourself. 

He owns a lot of Bitcoin. I'm sure he mined several blocks after he disappeared. He is now enjoying his life spending his creation.