A superstall is only the end result, the conditions alluding to it are not so much the engines and tailplane ending up in the turbulent airflow, but in the case of airliners the violent pitch-up motion associated with stall onset on aircraft with high sweep.
If you want to know you should read up about the lessons learned the hard way on the first flight tests of the BAC 1-11.... for example ever since then most, if not all new T-tail aircraft have rockets installed in the tailcone to physically force the aircraft out of an eventual deep stall. (Only during flight testing of course
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