The seem to suggest perhaps a Viewport failure rather than an implosion, in my wild speculation. The cover seemed largely intact and not bent as I would expect in an implosion.
*The wreckage seems* to suggest...
I think the view-port was only rated for 1300m
cyclic loading of connections between carbon fiber and other materials is my poison of choice. Unlike the aluminum of the Dehaviland Comet, carbon fiber gives way all at once - a fact known by many white 50 year old with experience military in carbon fiber marine construction
Guarantee the Viewport manufacturer has a primary $1 mil. And $10 mil excess liability policy. Their defense is being probed now.
The round flange that connected the titanium dome to the carbon fiber body was separated from the dome. That meant all the flange bolts popped. Total destruction in milliseconds.
It is clear the viewport failed. Was it it the cause of the implosion or did it fail because of the implosion? It might be a couple of years before before a determination is made..