I guess should be same as MS purged for EPS, this flag is set in the HSS per IMSI record in order to indicate that the subscriber data for the MS concerned have been purged in the MME. The parameter can take following value
- MS purged for EPS;
- MS not purged for EPS.
The default value is "MS not purged for EPS". The parameter is temporary subscriber data, stored in the HSS for a PS subscription.