err ... haven't heard of and doesn't sound logical to me. store in fridge negatives become cold. take out from fridge moisture in air condense on cold negatives ... wala ... all gone. maybe experts will like to comment?
Btw storing it in the fridge doesnt mean it extends the lifespan of the film. Since heat is its so called 'enemy' hence storing it will prevent it from getting damaged. Personally, I just store my unused film under my table in a Ikea box where it is cool. If you intend to store it in the fridge just dont open it our else there's no point keeping it there as the plastic film protect the film from moisture
Do not need to put in freezer unless you are buying in bulk for long term use (say 100 rolls cheaply over 1 year?). Put it in your camera bag for about 2 hours for it to cool down slowly (without direct interaction with normal temp) will do.
It is the temperature that have the impact on film. If in the dry box but your surrounding is heaty, it will alter the charateristic of the dilm like color balance and speed. But then if you plan to use it in the near future, then i guess should be ok.