Is the Arctic ice dissapearing faster than IPCC models say?
The IPCC said "Although the Hadley Centre climate model underestimates sea-ice extent and thickness, the trends of the two models are similar. Both models predict continued decreases in sea-ice thickness and extent (Vinnikov et al., 1999), so that  by 2050, sea-ice extent is reduced to about 80% of area it covered at the mid-20th century." 
The graph on this IPCC page shows a predicted decline in annual average extent of about half a million km$^2$ from 2000 to now. Your monthly average graph shows a somewhat faster decline over this period.

The SA article talks about the much more drastic decline in minimum (September) extent. 

I can't find any IPCC prediction of minimums, so you could say the IPCC failed to predict it or you could say it's in accord with what the IPCC did predict about annual averages.

Ice volume is also declining rapidly.