Tomoki is being apped from post canon while Rei a little earlier on. However, certain details about the case is already known to the public. In one point of the movie, we're shown that the pictures Rei took of one of the dead man, who happened to shattered when he fell after turning into stone, are printed in a magazine with a two page story written about it. It's why they're open about it. They're not exactly spilling secretive stuff. They kept the more major details that no one knows beside them and the police to themselves.
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Tomoki is being apped from post canon while Rei a little earlier on. However, certain details about the case is already known to the public. In one point of the movie, we're shown that the pictures Rei took of one of the dead man, who happened to shattered when he fell after turning into stone, are printed in a magazine with a two page story written about it. It's why they're open about it. They're not exactly spilling secretive stuff. They kept the more major details that no one knows beside them and the police to themselves.
I hope this answers your question. :)