Yes, their dispell is rather annoying, but I've never had my buffs dispelled by one (they only dispell the Root/Snare that I throw on them.)
Also never healed themselves, and try to flee at about 10 - 15% health, just like all the other kobolds. Seemed to have less HP than the hunters and defenders.
I have killed many of these and they have never gated. Not saying they can't, just that I've never encountered it. The mobs, along with the slayers both seem to run around 10%.