Bull. Driving a cold car is an assured way to ruin your gearbox early. EFI might be effective in keeping you from stalling but it also runs cold engine at 1,500 rpm at neutral which also produces too much torque for tranny to handle when you are pushing a brake at stoplights in a drive mode.
It is only worse on really cold days as I have never seen a car filled with transmission fluid suitable for really cold weather from factory. It would take you to drive 10 miles before it only warms up and starts to work properly, mechanical part of transmission would simply tear itself apart until that.
Drivers need to apply reasoning to the process. Outdoor temperature and how far you can drive at reduced speed need to be in the equation. Automatic transmissions are cooled by engine coolant. They are also warmed at start up by the same process. Slow, low load operation helps distribute the heat more evenly through the transmission.
I have a transmission temperature gauge for my vehicle which I pay close attention.