Is rebuilding security exit required for z/OS Upgrade to V2.3 after applying PTF SO00484?

Document ID : KB000117395
Last Modified Date : 11/10/2018
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PTF SO00484 is needed for 8 character TSO ids which is new with z/OS 2.3. The HOLDDATA for the PTF says to rebuild the security exit. Is the rebuilding of the security exit required if 8 characters TSO ID is not being used?
Rebuilding the security exit is not required after applying the PTF. The updated security that comes with the PTF will be used automatically.