Evictions don't even really turn up in any sort of reporting, credit or otherwise, unless records are filed in court and/or liens and judgements are placed/awarded and then those records can be any number of things depending on the circumstances and the state you live in.
Many of these reporting "agencies" or "groups" rely on public information or information that is provided by landlords. A landlord can opt to provide the rental payment history of a tenant to a reporting agency like a bank reports payment history of a loan to the credit bureaus but it is far from consistent.