The bottom drawer of the fridge has always been completley satisfactory for my needs. Ther is certainly no need to freeze film.
A freezer is (should be) a constant environment controlling humidity and temperature, the bane of anything perishable, especially anything with organic compounds, even in trace amounts. Any need to freeze film depends on the alternative storage methods and time constraints.
Since there are about 30 acronyms using WIP, which one of them did you mean to refer to? I take "Weapon Impact Point" Kinda nice or perhaps "Women in Photography", as it is more on-topic.
Waste Isolation (Plant/Project/?) New Mexico or Nevada. Store atomic waste in a salt mine. This was maybe 10 years ago, possibly more. I'm sure someone will correct me. (Oh, and I do remember "Wip Inflation Now!". Just wish I had kept my lapel pin.)
Typical frost free freezers use heater element to raise the temp enough to melt the little front that builds up. It happens few times a day. So.... that means the temp inside does go up and down on regular basis. I guess THAT doesn't hurt anything?
The humidity goes up and down as well, and my point was that we don't know!!!!
The amount of temperature and humidity in a freezer is well-controlled within a very limited range; many factors less variance than the external environment. Freezer systems meet health and safety guidelines and regulations for food safety. Film is likely the least perishable, least organic item in most domestic freezers. Freezers simply reduce environmental volatility and are the most controlled environment in homes.
Again, the anecdotal evidence is very strong that freezers are a safe place to store film.
There is evidence that the fluctuations in temperature and humidity can cause spots on film or film that sticks to itself. This is due to humidity primarily along with temperature changes.
If you look at a sealed bag of some moist product that has been frozen, you will see water accumulate in the container. It is coming form the product and is causing freezer burn. This happens on a micro scale with moisture and organics in film! It can hurt film. See the word "CAN" in that sentence. It can hurt film. Not "WILL" or "MUST".