Why does the zero-cost predictor not integrate with model search space module

[NLGithubWP]

In file NASLib/tree/Develop/naslib/predictors/zerocost_v1.py, it use the search space defined in NASLib/tree/Develop/naslib/predictors/utils/models. It basically defines some architectures of nasbench101 and nasbench201.

However, there is already a module called search_space. including many search spaces, and they are well-structured,
Why the zerocost_v1 don't use the model defined in search_space?