I don't think this is true. On ProAvalon, human players can see the full history of the game at all times [1], and use it to make decisions. DeepRole, on the other hand, can only use its internal belief state. This belief state is only a summary of what has happened in the game - DeepRole has no way of knowing who went on previous missions, or how people voted, or who proposed what. See above for more detail.
[1] See this video for an example: https://www.youtube.com/watch?v=LKdY4Us0Ci4