Yes, it has Back Torque Limiter or Slipper Clutch.
Believe it or not the C10 had one too, way back in 1986.
What this means is that if you downshift far enough to put the motor past the rev-limiter the clutch will slip.
The BTL is set so that it opens the clutch up enough to slip when the back torque gets close the no-fuel torque (drag) of the motor at 11,000rpm.
It prevents 2 things from happening. It stops you from over-revving the motor too much and stops the rear tyre from locking.
It will chirp if you do this while cornering and on some tyres they chirp anyways but you need to be either incredibly ham-fisted or else pushing REALLY hard to do this accidentally.
Doing it deliberately is easy and usually the only indication that you downshifted too far is that the needle stays on 11,000rpm until the clutch re-engages.
I've never heard of a slipper working only at/near redline.... should be x force generated causes the slipper mechanism (springs?) to work. If sufficient force is generated at any mph/rpm, the clutch slips.
Be curious to see verbiage from Kawasaki on your explanation being how this particular clutch works.
Not picking nits, just sayin'.