Firstly, it is not a demo
Secondly, this is shipments as of March, so it is fair to assume that the shipped number of games is roughly equal to those sold now, as they will have shipped more by now, so yes, about 600k DLed
Thirdly, given that this game was released at $40, and many of them were bundled, and it is cheaper in the UK, where the game sold loads, we can assume they get about $15 per physical game (as opposed to $25 for a full release), so assuming at least 500k were shipped, a fair number is about 2.5m copies at that value, which gives $37.5m. They you have to add in the 600k that were downloaded at $40, which gives another $24m as all the money goes straight to Sony, giving them just under $60m.... which sounds a little high, but chances are, they have paid for much of the development