The lawyer?  I don't see where he has been judged by any here as "not credible."

That there is more to this case than what this article brings out is fact.  "He is also seeking to declare the Diocese of Phoenix a “public nuisance,” due to the new allegations, coupled with past incidents of cover-ups of abuse." (from CRUX, 8/4/2017)

No, Annie....there is more to it.  Apparently, this attorney is looking to go after the Diocese - but "...the bishop (and Diocese) could not be prosecuted for letting church employees suspected of sex abuse be around children.

But Jacinto (DA spokesperson) said the agreement would not prevent prosecutors from bringing a case against O’Brien if there’s evidence that he sexually abused a child" because of the 2003 rulings.  

And wow. Lo and behold -  a new accusation to focus on - and a filing that includes the Diocese.  Interesting, yes?