It's an update on the situation until they confirm the bug fix is completely rolled out. I certainly wouldn't expect they tell their customer base how they can exploit a bug to bring down part of their business.

With respect to partitioning - we don't know how or why an invalid configuration could poison so many nodes; if the config was physically present on them or if there was a cascade of healing/balancing issues stemming from it.

I would leave speculation on many of your points at the doorstep until we see a full report.