You need to read the paragraph. Clearly it isn't just the view of one member he is referring to.
I always remember this statement from David Connett a journalist at the trial Roch
He did establish that she (Julie Mugford) went to the police after Bamber had upset her by ending the relationship. Personally, I couldn't understand how she could be relied upon as a witness, but others, particularly women, thought the contradictions in her evidence made her more compelling.
Julie Mugford would not have been a credible witness in my view Roch, if true, she knew of his plans she knew of his involvement in it, and she chose to cover for him, either way, depending how you look at things, she’s a guilty party in this by her own admission and she did it because he had jilted her.