I’ve lived my whole life according to Spartan discipline.
I take it history isn't your strong piont.
Oh I think he got most of it right.
Make citizenship so hard to get that they eventually ran out of citizen to fight. Check.
Abuse the slaves so they would revolt and their own citizen refused to do farmwork. Check.
Stubborn, hardheaded, supertitious and inflexible. Check.
Dug themselves into a corner and became a 3rd world power selling off their glory image as a tourist attraction. Soon.