That isn't quite what was stated now was it. What the report said was:
ES31. A previous NATS’ investigation into a serious communications system failure that occurred on 7 December 2013 identified a number of lessons and prompted associated recommendations by NATS and the CAA most of which were reported as closed off and in place ahead of this most recent incident. However, amongst these recommendations were three of particular note in the context of the 12 December 2014 failure. The first was to review with stakeholders the industry’s ability to respond to service failures and identify required changes to NATS’ crisis management capabilities, resilience of systems, procedures and service continuity plans. The second, made by the CAA, encouraged NATS to make best use of all means by which a crisis can be handled from an operational standpoint, including exploring the more effective use of and interactions with the Eurocontrol Network Manager (NM). Despite being assessed by NATS as complete before 12 December, it is evident that neither of these recommendations had been addressed fully. Finally, a review of the wider industry crisis response and resilience arrangements was recommended. Invitations to participate in the crisis response exercise were extended by NATS to major stakeholders in May 2013 and the event was anticipated to take place in February / March 2015, although that date has now been postponed until after this Enquiry reports.
It states that NATS had addressed all the recommendations but that 2 points hadn't been addressed fully, so hardly "ignoring", just not doing what they should have, which they have accepted.
I also got the feeling that the report compliments NATS handling of the situation in several areas including maintaining safety throughout and the speediness of identifying the fault. A review of the flow measures used will be undertaken to see if they can be improved in future system failures but there wasn't any condemning criticism of how NATS handled this particular failure, and they even agreed that ruling out ANY future failures is impossible in such a complex system.