She specifically said ADDING lean angle and accelerating at the same time. Anyone who takes the time to learn about traction knows that both actions are using it up and there is only a limited amount. So, if you are leaned, you can accelerate and pull yourself out of the turn, but you should NOT lean further and accelerate at the same time. It will cause your rear tire to give out and then if you let off the gas, you'll high side. It's better to slowly decelerate if you are at a steep lean angle and reset your line before accelerating (if you are running wide).
Now, If you are going slow and not leaned over at all. You can lean and accelerate at the same time, and you won't crash, because you are not near the limits of traction. That is bad practice, however, as it will cause a crash at higher speeds. So lean while maintaining throttle and accelerate as you stand the bike up coming out of a corner.
I honestly think that trail braking helps prevent this. Because it makes you think of slowing down while setting your lean angle and only speeding up after the it is set and you are facing the exit. Slow in -- fast out.