OK, I just tested, and it didn't work as described.
Tapping on the lightning bolt on the widget launches the app (I did not know this, but it makes sense -- I'm not a big widget user). I waited a few seconds (I could see the app trying to wake the car) and the port didn't unlock. I then went back to the home screen and re-tapped the lightning bolt on the widget, and on this second launch of the app it did unlock the port. What's not clear is if the first unlock succeeded after the normal 20s delay, or whether it was the 2nd attempt that succeeded. In any case, tapping the lightning bolt and the port instantly unlocking is not what I experienced.
I'll need to test again (next time I have the car plugged in and asleep -- I also have TeslaMate so can confirm when it is asleep).