Definitely is a Trail Edition! I don't know how serious you are about purchasing it, and in no way am I trying to steer you away from it, but take into consideration the fact that it is a very limited and rare trim. Although that is what makes it that much cooler and unique, it also can bring headaches, at least from what I've seen from friend's past experiences.
For the most part, the body, interior, and electrical components are the same as an Sr5, but of course it does have the locking rear diff. My main concern would be that if something was to ever go wrong with that third member, you may run into some issues with price and availability. As far as the rest of the driver train, I'd assume it's all the same, but I'd look into it beforehand.
I had considered a Trail Edition before I bought my sport, but once I realized the potential issues that I might face with having such a rare trim, I decided against it. I figured that with the open diff's increased size, which would make it stronger, plus the fact that an ARB locker would be cheaper than the increased price of the Trail trim, it was a more feasible route. Plus the seller KNEW what he had and wanted more because of that. In this case, the seller doesn't appear to know, given the ad doesn't say anything about "Trail Edition."
Again, not trying to discourage in any away. That thing looks clean and is definitely worth checking out if you're in the market for one. Just make sure you know what you are getting into before hand. I have a friend with a 22RE-T (turbo model) and I see how much struggle he has to go through to finds parts for it, given it is such an odd/rare commodity. Of course, different circumstances since his is engine related and over 25 yrs old, but figured it was worth mentioning.