The soufflé thing is because they take a shot of it when it comes straight out of the oven, looking all nice, which they use for editing, when discussing the dish.
The sequence where they all take it in turns to present their food for tasting, which takes about 5 minutes in the final edit, takes much, much longer to film.
So when soufflé goes up to be tasted it has probably been hanging around for best part of an hour, and has collapsed.
That is how it works in food telly land.