Gotta be honest, sounds like baloney... to think one could achieve an additional 200ms in reaction time by using a lightboost setting to eliminate motion blur seems a bit optimistic. Mind you, 200ms is around the average time it takes a human to respond to changing colors... where does this 'additional 200ms' gain in reaction time come from? Not talking smack, just curious.
I haven't heard of this 'tweak' so I looked a little bit into it and the vibe I'm getting is that because your motion blur will be eliminated, your reaction time improves with the improved visibility of your opponents... Although, I suspect this does increase your input lag slightly by adding an additional process.