The paper just says that Fermi estimation method is not applicable in this case. It does not say that there is no life, it says that is not the right way to est

The paper just says that Fermi estimation method is not applicable in this case. It does not say that there is no life, it says that is not the right way to estimate life existence. You can as well flip a coin, and then be amazed that aliens do not turn up when you guess heads right.