No fair enough, that was a bit of a lowball figure and with Dread Guard you can probably get to 29K or so without any serious compromise to other stats, but every single tank I've been grouped with or seen on fleet with 30K+ has only done so by letting one of their other stats down badly. (I have a compulsion for looking at other people's gear.)
I have given you HP number as well as the mitigation. If you are misinformed about the latest BiS formula that's your problem. But a guardian tank once full 63 with optimized BiS gear will have the stats I mentioned.