This is valid for part time 4WD or full time 4WD with center differential locked. Powered with that much torque they will break lose and spin without moving the vehicle. The other two wheels on firm ground with lots of traction do not receive any torque and do not turn at all. They do not prevent wheel slip. They only delay wheel slip.
Traction is lost a little later than without limited slip.
You will be stuck a little later. Fancy names like Trac-Loc are not locking differentials they are disguises for limited slip differentials. Diff locks disable the differential's ability to sense resistance. This guarantees that any wheel with traction will receive torque to move the car. They will keep you from getting stuck.