No, it doesn’t need to be. ISSF certification is intended for the explicit use in ISSF competitions. Athena is intended for entry and intermediate level clubs, well outside of the ISSF interests.
Athena is approved by the National Three-Position Air Rifle Council and the Civilian Marksmanship Program.
As a best practice, regardless of the governing body or electronic scoring target in use, always include in the match program the type of EST. For example, "All scoring will be done by Athena Electronic Scoring Targets."