This does not rule out positive feedback from water vapor. As I have mentioned, there is widespread disagreement on the feedback from clouds. The alarmists think that the feedback is positive, and the skeptics think that the feedback is negative. Even if the feedback is positive, we don't know to what extent. To get a runaway greenhouse we would need a feedback of 1 or greater. That would be a disaster. However, the figures I have seen have been around 0.6, which means that for every extra degree of warming, you get another partial degree of positive feedback.
I agree with the skeptics on this. Warming produces clouds. Clouds reflect sunlight back into space and make the Earth cooler.
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