Yeah, the tab is gone. Not all apps are updated to support it yet, but the new placement is under "What's New" on the app's App Store page and it differentiates between regular IAP and subscriptions.
“New placement”? I don’t see the IAP information anywhere now - iPad and iPhone. Unless the Mac shows something different that data has been wiped out completely. All you see is the disclaimer that it contains IAP. What apps show this detail data under “What”s New”? Thanks.
If you go to the Productivity tab, under Apps We Love - Sorted, Ulysses, and Bear have it. Under Photo & Video, VSCO has both the IAP and Subscriptions section. Shows up both in the iOS App Store and App Store Preview on the web (not seeing any on the MAS yet).