I just looked this up for you:
TMC will rewire the BCC and eliminate the potential of loss of chassis power. This defect will be corrected by TMC at no
expense to you, the owner. The repair should take approximately 30 minutes to complete
All they did was direct connect the chassis battery and take the BCC out of the loop rendering your chassis disconnect useless...You could put in your own such a good knife switch for that..
So instead of a fix , they design a workaround that eliminates the component....Reminds me of NORCOLD with their 1200's and the box...