The DWP will have a copy of the report, but the DLA decision maker may not refer to it. It is open to you to send a copy of the report but it will only form part of the picture. You will need to show why it is relevant and how it applies now. For example, if it shows his learning difficulties and some of his care needs arise out of his learning difficulties, then the report would be a good starting point, but you'd still want evidence of his current needs.