They are likely doing some interpolation for 200B or benchmarking it in wrong way. e.g. Hellaswag accuracy for llama 7b is 0.76[1], but it is written 0.56 in the repo. Even at 200B tokens, it is higher than 0.56 for llama looking at the charts.
Many people have been struggling to reproduce the benchmark numbers included in the original llama paper.