Full text of the JTSB Accident/Incident Categorization under which this event will be investigated:
(per
Ordinance for Enforcement of the Civil Aeronautics Act, Article 166-4)
Clearly this categorization encompasses both contained and uncontained failures.
While it's certainly true that recent JTSB engine failure investigations covered by this categorization relate to uncontained failures, that has no bearing on the JAL event - which clearly wasn't, as the investigation report will show in due course.