It seems you don't understand the function of the CCAA.
For the CCAA the scope of POA is up to the discretion of the court - and the court ordered the liquidation of the BioAmber assets.
The restructuring option wasn't available after the Court ordered first sale - going concern didn't produce any bidders. Then it was time for liquidation.
Since the Equity will be cancelled that is why the shareholders didn't vote on the Plan - the Court assumes the shareholders will vote against the Plan.
On May 24th the Court ordered:
"authorizing a distribution of net proceeds from the sale of the Debtors' assets to the Debtors' secured creditors"