Not only on just the panels but just overall being at Blizzcon? He was part of discussion not only on the panels but also off the panels and drinking with the community. If he were in that bad of standing at Blizzard, surely they would want him far away from Blizzcon as they wouldn't want him spilling any potential negativity either on stage or when hanging out with the fans.
The guy was generally enthused about his job and his experience there. It definitely didn't give the feel of someone who was leaving on bad terms.