AM sold more than that in chips alone before April, so it it's a pretty solid assumption that they've sold more than that in chips and miner since April too. They've also been mining for a couple of months too now, and we've seen fairly large sums of BTC being shifted around known AM addresses.
How do you know they sold more than 6Ph/s chips in April? Do you have a proof or are you pulling the numbers out of your...belly?
Also do you know the speed of the self mine or it's out of thin air again? Last that I know Am had 200Th/s on BTCGuid. Haven't saw any other official number yet.