Update, 22 October: still Waiting for Review, now 17 days since the first submission and 8 days since the resubmission. All agreements (Program License, Free Apps, Paid Applications) are accepted and Active, the App Store Connect banner is gone, and the same build passed TestFlight beta review. A second expedite request was accepted today. Still no reply on support cases 102994334515 and 103001365442, and no phone option is offered for this account. If anyone at Apple can check whether submission 6812830390 is stuck, I would be very grateful.