Bullshit.
"ropane Freezing Point
The freezing point of propane is -306.4°F (-188°C), a temperature that can only be achieved in laboratory settings and is far below any natural Earth temperature. However, propane does have a boiling point of -44°F (-42°C). At this temperature, liquid propane can no longer vaporize into a gas, which is the state it needs to be in to be usable in appliances. While it’s highly unlikely that propane will freeze in a home propane tank, extremely cold temperatures can cause the liquid propane to contract, leading to a loss of pressure in the tank. This can affect the performance of propane appliances, so it’s important to ensure your tank is well-maintained and at least 30% full during cold weather."