Good vid...
This is a really good application for the SIRT laser gun (or equivalent) at home...The only thing missing is the recoil, but after all, one can practice "recoil" any time at the range, and that is not what is being tested here per se. What is being tested is the ability to manipulate your light source and gun to acquire the target while going from dark to lighted environment. DSK approach is the better of the two approaches obviously - because it adds a "shoot no shoot" decision...
SIRT, doesn't replace dry fire with a real gun, but it has a lot of uses which add lot's of value to a dry fire regime. All done from one's home, save ammo, reduce automobile pollution, help saving the planet ;-).