That letter refers to the remaining assets after the liquidation, which was some remaining inventory, office stuff, etc., minor stuff. The patents (including BioAmber’s interest in patents shared with others) were sold in the liquidation. Those assets were also sold with the approval of the court and the creditors who had security in them (and everything else).
That’s a new letter for this board, and I can see why it wasn’t posted while the pump and dump was still in play, as it clearly states the shares held no value whatsoever back in 2018 after the liquidation and nothing more was coming. That wouldn’t have supported the fairy tale buyout very well. It appears the PWC lawyers thought the shareholders’ lawyer was a numbskull the way they presented their answers.