Glad to see someone questioning the tire fire information.
That is clearly fuel burning on the ground behind the engine.
The failure sequence probably went something like this:
What is more likely is that some fuel system component outside of the core engine failed inflight and began leaking. While inflight, the airflow probably kept it separated from a combustion source.
After landing, the airflow around the core engine changed and a puddle of fuel developed inside the duct or inside the cowling. It was lit off then and fuel continued to be added until the engine was shut down. (Was there a cough or bang out of the engine during the rollout? )
If the fire had started inflight, the crew likely would have received some warning, but that does not appear to have happened from the info I've seen.