Is New Jersey essentially saying "We acknowledge that we have no case but please help us string out the status quo for as long as possible"?
Without seeing the extension motions, I wouldn't read too much into a motion for an extension at the appellate level. Government lawyers who practice in the appellate courts have no way to control their workload. The only recourse is to reschedule some briefs. Most appellate courts will be somewhat lenient on this except in unusual circumstances.