I always blip the throttle when downshifting the rocket before applying brakes.
It matches the engine revs to the next lower gear for a smoother shift.
I do it on my stick shift cars.
Listen to formula one cars. they all do it too. (The paddle shifter does it automatically.)
In fact my wife's automatic Can Am Spyder blips the throttle, too, like the F1 cars.
So to answer your question, ALL manual transmission vehicles may be downshifted in this manner prior to braking.
The only exception might be a panic stop where multiple downshifts would take too long to avoid a crash.
On a stock bike, the pop is not harmful.
When I had the stock exhaust I would get small explosions in the CAT box if I blipped on downshift just so.