That's different from the situation noted in linked article. That happened before the airspace was closed.

I'm very curious to hear more about this. All we know so far is that it was apparently cylindrical and the size of a small car.

I'm wondering if it was a small zeppelin. The shape would be more suitable for piloting, but it could stay aloft longer than a drone; would not surprise me at all if the Chinese were experimenting with those.