> His main evidence is that the effect on weather of the soot produced by the oil wells burning in Kuwait in 1991 did not match the nuclear winter theory predictions.

As made by some of the original nuclear winter paper authors.

Mostly going from memory there's a lot that's wrong, unsupported, questionable, or nor longer relevant about the TTAPS paper. The easily unbalanced one dimensional model of the atmosphere, where there are no winds or oceans, particles can just go up and down. No support for the size range of soot produced. Very few cities in the US or USSR with enough fuel to produced real firestorms like the Tokyo one in WWII. And now many many fewer nukes in both nation's inventories.