_Limusaurus_ reminds me of shuvosaurids like _Effigia_ more so than ornithomimosaurs. The latter have very long forelimbs that appear to have been adapted for hooking foliage and bringing it to the mouth. Therizinosaurs also had long forelimbs, and were most likely herbivores - but the large manus does not seem well adapted for hooking or gripping branches.
...although, in ornithomimo- and segnosaurs alike, the head + neck is still longer than the forelimbs.