Going further back, I remember when that watts per square metre (the 2200 in your weather report) was introduced as a replacement for whatever windchill calculations they were using before.

One thing many people I know get wrong about windchill is the effect on needing to plug in a vehicle's block heater. If you normally are good down to -20C on a calm day, you'll also be good down to -20C on a windy day, despite windchill being far below -20. The engine will cool faster, not farther.

No matter how fast the engine cools off, it still won't get any colder than the actual air temperature. Of course, that also means that if you are good for 4 hours at -20C on a calm day, starting with a hot engine, then adding wind means you might only be good for 2-3 hours.