Not clear whether he has been purged. The "official" position was that he had health issues. The fact that they removed him publicly is odd and suggests that it might just be true. If they'd wanted to purge him, they would have done so behind the scenes. Purging may also be done to make a point to anyone else who could be considered a threat but this video was only seen internationally (local broadcasts hadn't started at that point) and this footage is taken from the Taiwanese feed (unsurprisingly they feel the need to cover these things).