I asked them to apply the TSB because my surround camera image was extremely dark when pulling into the garage on a sunny day. I couldn't make out any details. The TSB fixed this problem but it also seemed to improve the display when backing out of the garage.
I had to play around with my settings a bit to answer your question about backing up... as mentioned, most of the time, I leave the instrument panel dimmer in "Parade Mode", which leave the display screen at 10 regardless of whether the lights are on or off. But I switched it down a notch so there's a difference in the two levels, and there is still a delay. So I went back into the Settings page for the Display. I don't see a delay setting... but I think I have a headlight off delay set (so they stay on... next trip I'll see if turning that off affects the display.
I had to play around with my settings a bit to answer your question about backing up... as mentioned, most of the time, I leave the instrument panel dimmer in "Parade Mode", which leave the display screen at 10 regardless of whether the lights are on or off. But I switched it down a notch so there's a difference in the two levels, and there is still a delay. So I went back into the Settings page for the Display. I don't see a delay setting... but I think I have a headlight off delay set (so they stay on... next trip I'll see if turning that off affects the display.