Presuming it’s a true “recon” call whereby the original application is re-opened/reconsidered, not a new application taken over the phone during an alleged recon call, the “timer” (application date) does not change. Most of the time the SUB does not change during the interval between application and recon call thus the concern is often moot.

I’ve had many approvals during or after a recon call with AmEx (and also Chase). In every case, without exception, upon approval, the SUB in effect on the original application date has been honored, not the SUB in effect on the recon call date.