Is it true that psilocybin can cure depression, anxiety disorders, addiction, etc.?

Yes and no. There are now countless reports on the internet from people who swear that it was their salvation. Many of these stories are true (certainly not all, we know the internet) and I have witnessed many of these experiences in real time. But microdosing is not a miracle pill that solves everything without you having to do anything. It's great to use as a building block and often ignites miraculous changes. 

However, there is almost always more to it than that: people often spend years working on themselves, confronting their past, learning mindfulness and taking responsibility for their lives. Change always requires a will. Microdosing allows many people to allow intellectually understood wisdom to penetrate their subconscious, to heal their body and to revive atrophied nerves in order to feel their body and their emotions fully again.

Potential, happiness and healing is intrinsic in everyone, microdosing can work as a key. 

The fact that you are reading up on the subject is a good indication that you are practising awareness and would like to live better. If this is the case, truffles and mushrooms can work really well as fuel to make the changes your body and mind need.