Ok just posting to finalize the issue
NAT OPS DOC 007 is for guidance only as mentioned in its Foreword:
This Document is for guidance only. Regulatory material relating to North Atlantic aircraft operations is contained in relevant ICAO Annexes, PANS/ATM (Doc.4444), Regional Supplementary Procedures (Doc.7030), State AIPs and current NOTAMs, which should be read in conjunction with the material contained in this Document.
This means, ICAO Doc 4444 ATM/501, Air Traffic Management (PANS-ATM), Section 15.2, is the regulatory material for the Special Procedures For In-flight Contingencies In Oceanic Airspace and not Doc 007.