It would be interesting to see how this went down. It appears, from the article, that the company was in contact with the tower and appears they were allowed to land late. Otherwise, why would they takeoff? But it seems something changed in flight.

I also think the tread's title is misleading. The company was aware of the airport closure, it just appears they thought they would be able to massage the situation a little -- which airlines do a lot with things like this.