As per the article, non-viral hepatitis is cause by things others than viruses.
The paper uses "viral hepatitis" to refer to Hepatitis caused by one of the Hepatovirus species, which are also commonly called "Hepatitis A Virus" to "Hepatitis E Virus"
So that sounds like there are characteristics of the etiology of viral-hep as opposed to non-viral which don't appear in this case of hepncaused by a virus? I'm not very familiar with the subject
To get the conspiracy theorists going: Ad41 has been considered as a (basis for a) vaccine vector