[Floyd]

If you have a museum and the cars will never be run, then you can use it or better still leave them empty. The lack of water will reduce the long term corrosion from water. However ,as 38V8 says, nothing has the heat capacity of good old water.
Yes the stuff is a blend of propylene glycol. If you have a museum with 50 cars that may be driven rarely then maybe it would be OK. For that their is a small risk of the overheating from the lack of water cooling property.
If you have one or a few cars and you drive them, just use a good antifreeze mixed 50-50 or 60-40 in the cold country.
Don't overthink it.
Just my opinion