They are removing one of two bolts (rear one) from the bushing on control arm holding rear axle in place. this will decrease binding then one of the sides drop. Increasing flex. I personally wouldn't do it for safety reason. If due to increased stress remaining one brakes on hwy such as hitting pothole result would be disastrous. Flex will still be limited by bushing upfront.

Keep up the good work Carlos
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92 SR, 285/75R16 Yoko MT ARB locker GAST compressor AirLift 1000 MM10500 Snorkel custom rear bumper
02 Montero LS died protecting the master
08 PowerWagon (stock!)