I haven't read through to see what it actually says, i just saw "IIR" under the entry. So i'll reserve judgment until i am able to.
But you do bring up a good point that i've actually been considering as i've read this magazine. The point is, how much weight do we actually give government/military sources? I've always given them the benefit of the doubt because, they're official sources so one presumes them to be correct, but that might not be the guess. At any rate though, it's better then Global Security's numbers.