Yup, a Dubai version is LHD. If it's converted, that would most likely be from Japan.
An original LC100 LHD will from anywhere between 1.6 to 2++M second hand. If he's selling it at over 1M and it's converted, maybe you would want to consider a local LHD Patrol.
Reliability of a converted will be a hit or miss thing... but don't expect it to be as solid anymore since they already cut up the car and stuff (even if original LHD parts we're used).
BTW, take the words "we used all orig LHD parts for the conversion" with a grain of salt. They all say that when you go asking around.