No, have never gotten an official reply about this - app updates with support only for Sign in with Apple only on iOS 13+ were approved without issue, but still don't know for sure since we haven't gotten to the updated required date.
Futumsh
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Still broken when it resolves to the 17.120.254.x range, but working if it resolves to the 17.173.66.x or 17.42.254.x ranges.
Not marked green anymore, for whatever that's worth. Did anyone have a specific IP address for the endpoint that was still working? I did a scan through some of them and didn't find a working one.
Also getting the issue with the receipt validation endpoint responding with 'Connecting to iTunes Store' HTML here, since about an hour ago.