And only 89% of players have completed the first story on Destiny according to the PSN achievement list. So your numbers represent what? The amount of people currently playing the game or the total who still play and have at least 1 character at level 30 in order to compete in both raids. Do you see how inaccurate your numbers are compared to the population that is consuming DLC. Consumers of DLC are again those who play the game a lot. I am willing to bet that most people who purchased the house of wolves have played in a Raid.
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The 81% is from players eligible to do the raid
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Here's an old link, but nonetheless proves my point that more people play the raid than have completed them. http://www.forbes.com/sites/insertcoin/2014/10/11/bungie-reveals-how-many-players-have-beaten-destinys-vault-of-glass-raid/