PCM6240-Q1: About VBAT pin when diagnostics is not used

Hi experts, 

I'm a little confused that it should tie VBAT_IN to VBAT or VBAT_IN floating when diagnostics is not used.

What is the difference between 2 threads.

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1244204/pcm6240-q1-pcm6240qrtvrq1-s-vbat-pin-wants-to-be-connect-to-gnd?tisearch=e2e-sitesearch&keymatch=pcm6240%20VBAT#

and

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1053003/pcm6240-q1-working-condition-parameters-questions/3896032?tisearch=e2e-sitesearch&keymatch=PCM6240%2525252520VBAT#3896032

In my understandings, VBAT can be Floating(Open) if disabled in the register setting, but VBAT connection is required if not done. Is this correct?

Regards,

Youhei MIYAOKA