He is an experienced lawyer, but not in public company bankruptcies. Public companies make up about 0.0001% of all US bankruptcies each year, so it is extremely rare for any bankruptcy lawyer, even the most experienced ones, to have ever worked on one. And knowing to notify FINRA, and provide them with the required documents, is not taught in Law Schools.
If the commons were not cancelled, it would not have been required under the Plan, it would not have been approved by the Federal Court, and the Q would not still be on the symbol. But since all 3 of those things actually happened, it should be obvious to anyone that actually read the Plan and the Court's approval that the old ARIOQ common shares no longer exist.