If aspects related to safety have been uncovered and affect other aircraft types that are currently flying, there is a duty to highlight them as soon as possible whether or not they are causal to the accident under investigation.
Nothing to disagree with in that but by the same rational it would suggest that no other conclusive technical issues have been found to date.
In any event it would seem that the report highlights one of process than material causation of an accident and from today's CAA statement seems they found some paperwork they couldn't find yesterday.... You couldn't make it up!