Any examples where the ONLY evidence given in a case where someone was found guilty was a victims testimony alone?
I'd be fascinated.
I would suggest that the post you quote is reference to cases where the perpetrator does not give evidence as opposed to any other witnesses other than the victims. A perpetrator may chose not to take the stand and therefore not give evidence. In the case of Saville and Jackson they will of course never give evidence as you can't prosecute a dead person. However, a formal inquiry may determine they are guilty.