The reality is that if they file for Chapter 11, it will include a restructure plan.
All of that has to be approved by the court of course, but typically, there isn't much choice...creditors usually don't want to see the organization go away (liquidate) as that usually means they get little or nothing on their outstanding balances with the company. Restructuring the debt (often including wiping or reducing some of it) is the often the only means of having even a chance of recovering outstanding debt. Liquidation (selling all assets and paying creditors with proceeds) is a very last option usually used when there essentially is nothing left to move forward with. Not exactly the case with Citadel.