Oh please. You might as well believe in the tooth fairy. If soft tissue was incased in several inches of diamond ... perhaps. In rock the dessication alone would dry it up and petrify it.
Of course the scientific community will believe it. They HAVE to.
This soft tissue was encased in petrified bone. The article talks about the very special circumstances that led to the soft tissue surviving.
Is this type of preservation common? Probably not. However, the existence of this soft tissue is proof that it CAN happen.