It's from their financial reports. They can only report the revenue they receive. The can't include money that Activision made to their own investors.
But they would have received it. When somebody buys say COD on PSN it doesn't matter that Sony only keep what 30%? of the amount, the full price would still be paid to Sony and go through their bank before being paid onto Activision.
Bet Shiken that COD would outsell Battlefield in 2018. http://gamrconnect.vgchartz.com/post.php?id=8749702