what he was emphasizing when he released his original model; back then he was more than happy to make full-on hysterical predictions based on the absolute worst-case scenario, and in turn the Media were more than happy to run headlines off them.
Then after the conditions changed, he now expects everyone to ignore what he said before and believe that his new, measured predictions are what he meant to say all along.
You don't get to scream "FIRE!", have everyone rush to the scene with water buckets, and then say "oh, I meant to say 'campfire'" and not expect to have some pushback from people.