Wait a second, the tonnage comparison is even more wrong than I thought. The WW2 USAF tonnage was 1,463,423 tons or 1.463Mton. The Iraq 1999-2000 tonnage was 535ton, not 535Mton.
So the ratio is 535/1,463,423= 0.00037 ~= 1/2700
Conclusion: The Iraq 1999-2000 bombing tonnage was 1/2700 of WW2 USAF.
So yeah, the whole Clinton-bombed-more-than-WW2-USAF is off by a factor of 2700. Quite a large error, is it not.
PS: I also spotted the error involving the 1.3M number from counterpunch. The counterpunch article converted tons to pounds, hence the ~1.3Mpounds versus ~624tons for 1999-2001(Clinton+Bush2). Keep in mind that Mpounds is a much smaller unit than Mtons, by a factor of ~1000/0.457=2188.