"Surely, Prefect, this has gone far enough!"
Wiki reminds us this 'new' information is actually a more detailed presentation of DNA results first done in 2014. Wiki already has some links up questioning it for a variety of reasons. But with more information the active Ripper community will doubtless provide more analysis in time. The provenance of 'her' shawl and whether the forensic details suffice to show the semen was from not just a client, but her final client need to be established adequately as much as the DNA details.