They rolled the supplemental update into the current release.
I thought supplemental released Oct 5
But now it’s in the full installer...
Incorrect, since I do exactly remember that once supplemental update was released (October 5, I guess) the High Sierra release date on MAS was updated to the same date. So, this "October 12" is another "update" to High Sierra on MAS.They rolled the supplemental update into the current release.
So you're saying that the installer will be updating later - not same time with update? I have always thought when update comes out - downloaded installer on App Store will keep the latest updates as well.
Edit… so when next bigger update 10.13.1 is available on App Store. Downloaded installer is 10.13?