anchorage flight really planned on landing at O'Hare?

I’m not knowledgeable about this, but I was watching a lone jet heading for a closed O’Hare. It came down to FL130 ft 8 mins. before the scheduled landing before going back up when diverted to Columbus.

Did the pilots really not know that they couldn’t land at O’Hare? It looks like they were in contact with Chicago 30 mins. before being diverted. Why descend if you know you can’t land?

flightaware.com/live/flight/CKS827

5 hours out it’s tough to say if the airport will be able to get you in or not. We’ve seen crazier attempts in the past.

Being from Alaska, I thought maybe the pilot was saying to Chicago, “You’ve only got 2 foot on the runway? I just left Anchorage that had 3!” And then extended the skis.

flightaware.com/live/flight/CKS8 … /PANC/KORD
flightaware.com/live/flight/CKS8 … /PANC/KLCK