UUID stands for Universally Unique IDentifier. We use it as an ID for tracks and queries. See this for more details.
Yes. Any NLP models that are not trained specifically for the CityFlow Benchmark are allowed for Track 5.
The repository is available on GitHub: https://github.com/fredfung007/cityflow-nl.
The arXiv paper of the CityFlow-NL dataset and the baseline model is available here.