Yes, REIN can show itself as high errors. But then with the 6ish db snr it looks like DLM has not seen an issue. The sync looks about right for the attenuation. You have tried this in the test socket, haven't you.
Openreach attend a fair few REIN faults each week. They hard bit for you, is persuading your ISP that there is something wrong, then if they send an engineer, persuading them that it's REIN, then hoping that the REIN engineer can actually find the source, and get the sources owners to deal with it.