what does Elizabeth mean when she criticizes Miss Bingely for her judgment of Wickham his guilt and his descent appear by your account to be the same?

I'm not entirely sure about the wording of your question. Still, Elizabeth takes Wickham's story at face value and makes the judgment that he has indeed been treated unfairly. It is ironic that Elizabeth criticizes Miss Bingley for her prejudice against Wickham when in fact Miss Bingley is correct and Elizabeth is the one who is prejudiced.