To my great surprise, he was!
To quote myself from Wowhead:
Aspect of the Wild no longer exists in MoP, which forces the tamer to take massive 32k ticks from Kirix's aura. Fortunately, the minor glyph Tame Beast shortens your taming time by four seconds and the talent Aspect of the Iron Hawk reduces the damage you take by 15%. With the glyph alone, the above method still works, perfectly countering Kirix's knockback and stun.For the record, that's the lowest my health's been since taming him the first time, when he actually killed me as the tame went off. Typical!
The only difference I noticed in 5.0.4 is that Kirix's toxin cast now interrupts the tame beast cast, even through deterrence! So you need to cast tame beast AFTER the toxin cast. The timing needs to be a bit tighter, but it's completely doable.