It seems his condition is indeed more dangerous than Kim Jong-un's death

‌If his death had been officially confirmed, all the media outlets would have gone into a frenzy.
However, it is also difficult to view his condition as being perfectly healthy; it appears to be a health crisis.
YTN wouldn't have just fabricated news of his death without any sources.
If he truly passes away, there could be a bloody struggle for the position of successor.