Yes, I recall seeing that too, and discussing it here somewhere; not sure if it was in this
thread or another.
I understand that Carolina Extracts touts their supercritical CO2 extraction process. This is almost certainly cleaner than the traditional solvent/base extraction that may or may not still be in use by other producers of raw nic, but even if it's completely unique, the resulting nic will not have physical properties that are significantly different than any other.
Anyway, it would certainly be interesting to hear any explanation from them as to why they think their nic base is special and shouldn't be stored in a freezer, when pretty much every other vendor recommends it, and I've shown that it's clearly better than storing at room temperature.
The only plausible explanation I can think of is that by "freezing" they mean temperatures low enough to actually freeze the solution solid, but temperatures that low cannot be achieved in a home freezer, not by a long shot!