are you saying someone in Kabul is in love with the figure "30"? How does ISAF know how many taliban died in such and such attack?
I can tell you that in Pakistan the PAF's figures for airstrikes are more varied, but totally unreliable. My friends tell me that they make up the figure almost literally by pulling it out of a hat (or their ass, as the case may be). I find that the taliban themselves are much more scrupulous about reporting losses (though they in turn exaggerrate their successes by factors of 100 or more)...