The battery modifications such as the extra insulation between cells addresses issue 1. The stronger box addresses issue 2.
Neither address the problem, the cause of the failure. This is why the FAA describe the changes as 'improvements' and a not a fix, solution or answer to the problem.
Apparently most of these events were due to excessive discharge while on a ground. When an LI battery is discharged below its minimum level it should not be recharged up to normal levels again so it is replaced. I am not an expert on this but some smart people earlier in this thread explained this. This is not a safty issue.
I don't believe this. Every LI battery has protection against such possibilities because of the well known danger. A $16k battery in a critical safety situation with a revolutionary over/under charging system failed in its most basic task?