Not to make you second guess yourself but it always trips me up when people say they know that there is no post death experience. It seem gnostic.
The shrooms statement could be true for some perspectives and is impossible to proof either way. The idea can be used practically, to understand that death is nothing to worry about and even comfortable can make it easier to live life in the moment. But i have no idea why a healthy person would seek it out because it’l happen on its own for everyone anyway. Might as well live out the magic of this reality now as i experience it.