How would a blind trust prevent somebody staying in a Trump hotel from calling Trump from the hotel phone? How would it prevent them from doing a video call so

How would a blind trust prevent somebody staying in a Trump hotel from calling Trump from the hotel phone? How would it prevent them from doing a video call so Trump can see they are in a Trump hotel? If a Trump hotel was sold by the blind trust it would be public and Trump would know that it wasn't his hotel anymore. It would literally be impossible for a blind trust to work in this situation. A blind trust only works if you don't know what you are holding. It would be impossible for Trump to not know what he is holding since the sale of a hotel would make the news.