The reported weather would indeed suggest that the runway was CAT III at the time of the accident. However, it is not pilot error if the aircraft commander reasonably believed that he needed to land immediately; an uncontained fire would surely qualify.
Now this is speculation, but if the a/c had been able to safely maintain flight, and had diverted to a suitable alternate, it is likely that the organ would have been lost, which would have endangered the life of the recipient. I am curious - would that in itself constitute sufficient reason to continue the approach below minima? Not saying this is what actually happened, just curious.
In the event, it appears that the decision to continue saved at least one life. Respect to all concerned.