DaveReidUK
It is interesting to note, that you immediately jump to another occurrence in trying to evade this very clear statement by the JTSB, that they are investigating a "situation similiar to damage to an engine (when debris penetrates the case of the engine)". Such a tactics is an immediate admission that you are out of arguments and your statement/assumption was wrong.
In your yearlong crusade you overlook the obvious: WN-1380 was an uncontained failure, too, despite the fan containment ring not having been penetrated though having suffered a breach. Even though the NTSB was very careful in their wording and never described the event as contained or uncontained engine failure, their analysis makes clear, blade fragments exited radially before the containment ring at WN-1380 causing significant damage to the engine inlet, when they wrote:
"One difference was that the fan blade fragments that went forward of the fan case and into the inlet during the accident FBO event had a different trajectory (a larger exit angle) and traveled beyond the containment shield. Another difference was that the inlet damage caused by these fan blade fragments was significantly greater than the amount of damage that was defined at the time of inlet certification."
A very similiar event to WN-1380 with almost identical damage to engine containment ring and inlet, WN-3472 of Aug 27th 2016, was clearly called an "uncontained engine failure" by the NTSB. In addition, FAA and EASA both called that event of 2016 an uncontained release of debris in their resulting airworthiness directives stating:
"An occurrence was reported of fan blade failure on a CFM56-7B engine. The released fan blade was initially contained by the engine case, but there was subsequent uncontained forward release of debris and separation of the inlet cowl."
In the EAD
2018-09-51 following the 2018 engine failure the FAA wrote 3 days after the accident:
"
This emergency AD was prompted by a recent event in which a Boeing Model 737-700 airplane powered by CFM56-7B model engines experienced an engine failure due to a fractured fan blade, resulting in the engine inlet cowl disintegrating. Debris penetrated the fuselage causing a loss of pressurization and prompting an emergency descent. Although the airplane landed safely, there was one passenger fatality. Fan blade failure due to cracking, if not addressed, could result in an engine in-flight shutdown (IFSD), uncontained release of debris, damage to the engine, damage to the airplane, and possible airplane decompression."