I know this is an old thread, but I came across it while searching for images from the movie, and I happen to know the answer, more or less, to the question. I was the VFX art director on the project at ILM. The endo in the screenshot doesn't have a specific designation in the movie, although T-900 sounds about right to me... The studio wanted the game's endos represented in the movie, even though they were designed with very little input ( a couple of paintovers from me) from either the film crew, the VFX crew or Stan Winston's team. They were pushing to put them in the Future War scenes, but Jonathan Mostow didn't like it (privately he called it the VGC-800, which stood for "Video Game Crap"), and wanted to satisfy the requirement without featuring it in the foreground - so we kind of buried it here, where almost no one would ever see it except for you sharp-eyed people. Sorry this isn't a cooler, in-universe answer, but that's how the thing happened to be there.