My experience has been that it starts the car and whatever climate settings you had on when it was turned off. (Not the seat or steering wheel heaters, though.)

The process that works for me to get it started from the FOB is:

1. Click the Lock button.
2. Click and hold the Start button (the clockwise circular arrow with HOLD next to it) for several seconds, until the blinkers blink 3 times.

This probably takes about 15 seconds total, but works consistently for me.

 

Sounds right to me. I use it to pre start the climate semi-regularly as I approach the car. Two caveats: 1) the key fob range is so-so, maybe 100ft? 2) it does not work while the car is plugged in even though the app climate start does work while plugged in.