URT = Unified Reat Trianlge. Basically you can see from you pics that the rear triangle encompases the seat stays, chain stays and bottom bracket/crank. I believe this bike is also set up as a sweet spot bike, but don't get caught up in the terminology.
The 3 MAJOR deficincies I see in this design are
1. Whan you stand up out of the saddle you are loking out the rear travel, making it a hardtail. Ie if you are doing a steep climb and you stand up out of the seat you will now have no reat suspension travel. Its also applies if you get out of the saddle for a seep/rough descent.
2. These bikes are very prone to the suspension being compressed (bouncing) from your pedal input.
3. As the suspension compresses/extends the distance between the seat and bottom braket varies. This is not good for pedal efficiency nor for someone who has bad knees and finds if difficult to find a comfortable seat height
Again... some people love URT bikes, but I have never rode one that I liked. It is a old design that many manufactures have goen away from. You still see a couple companys making URT bike (like the Rocky Mountain pipline) but those ore sort of niche bikes
I say take it out for a spin, but don't buy it without trying some other designs
