I've never seen that advice anywhere before (the .pdf linked above) and can only assume that this works for the lower specification cells they use in flying.
Phones, computers, etc. all have instructions that state low temperatures must be avoided. Since we know the electronics work at low temps (aircraft engine controllers, spacecraft, satellites, etc.) then the batteries are the main concern.
As I said above, my experience with cells for RC cars and low temps is that they don't like it and they deteriorate rapidly. HTH
