It can't.
I know if I miss the gear gate or have a slow down shift,
it stuffs the whole corner as you cant slow enough at the right time,
even though the rear brakes on my car are well up to the task.,
I have done a fair amount of circuit racing, but wouldn't say I'm an expert,
Just my opinion that rev matching or heel+ toe braking is not something that is right up there on the list of things you need to learn,
but in saying that I never got the hang of left foot braking apart from rolling starts either, even though it does hav it's advantages in places.
On a side note, ever tried heel + toe braking in a car with a pedal box and no brake booster?
Seem to have started an interesting discussion here...