Moisture will degrade the raws over time. No need to keep them in a freezer, that's just old bro science that's floated around for years.If the raws stay fine in an oily solution like any injectable oil for years, then it's pretty safe to say they will stay fine in a freezer for almost a life time. I don’t have any data on hand right now but I bet if anything they will not lose much potency during the 15 years in the freezer at -18°C.
I've recently used raws that were vac packed and buried for 15yrs, Zero difference that I can notice (no lab tests though). Also used finished oils that were 13yrs old, made with GSO, zero noticeable difference.
Key is to limit exposure to air/oxygen (Vac pack them), keep out of UV light.