This seems to be pretty old. The Indian Wells main draw used to include 64 players (and hence 8 qualifier spots), as it says on this link, until 2003. Then it received an upgrade in 2004 - 96 players in the main draw and 12 qualifier spots, which is the current format and which has also been used in Miami for a while. If you take a look at the ATP calendar provided at their official site, you'll see that this year the size of the draw was kept - 96 players. So this link on the ATP site you provided me seems to be from 2003 or earlier.