Yes I see now, the 2nd post crossed between us.Yes, but on 9/23 Apple re-released 12.6.3 for those that needs to use iTunes for installing Apps. It just wasn't picked up until yesterday in a thread and today on the front page.
https://support.apple.com/en-us/HT208079
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No its not. Please check the support article and the thread in High Sierra sub-thread.
It was introduced on 9/23, but no one found it until yesterday.