They were not maintaining tire inflation I am guessing. Didn't we see another case of that recently? Someone is falsifying inspection and work documents and the airline does not have adequate controls in place to detect this until the tire bursts into flames.
I listened to the ATC. They even lost radio contact with it in the air. It was an engine fire while it was in the air from what I could gather. Probably still a maintenance issue, but the tires probably popped from the flaming engine.