Your excuse doesn’t make any sense because the flash frozen animals are in the same state today. It’s not the cooling you need to find an excuse for but rather the warming that provided the food for these animals just prior to them being flash frozen. It was warmer then than it has been afterwards or the animals would have decomposed. You’ll likely find that the freshest seeds and grasses preserved in the permafrost is the same age as these preserved animals.
First of all I provided an explanation or hypothesis, not an excuse. Excuse implies making an apology for. This was not an apology but an attempt at scientific discourse. If the major bolide strike hypothesized by Firestone et al occurred in warm weather, then the food in the animals and the surrounding ground would all have warm weather flora. It is hypothesized that a bolide strike the size large enough to plunge the earth into 1,500 of Younger Dryas cooling could have caused such a disruption in the atmosphere as to cause short term super cooling, thus flash frozen animals with undecomposed and undigested plant food in their bodies. Your last sentence would be correct under these circumstances.