Earlier quoted context omitted.
The idea that "Sparta" was close to "80% enslaved people" is confused and I hold the author of the linked article responsible for not clarifying the confusion. "Sparta" is the name of the principal city of the city-state of Lacedaemon, which comprised the regions of Laconia and Messinia in the Peloponnese. The inhabitants of the city of Sparta are in ancient sources referred to as Lacedaemones ("Λακεδαίμονες") and ar…
>The idea that "Sparta" was close to "80% enslaved people" is confused and I hold the author of the linked article responsible for not clarifying the confusion. ... >The people inhabiting the greater area of the Lacedeamonian city-state, the inhabitants of the settlements in Laconia and Messinia, were never referred to in any ancient text as "Spartans" or "Lacedaemones" and they were only referred to, to the extent t…
So if you want to say that the people who lived in Laconia and Messinia were the slaves of the Spartans, which we call the helots, and that there many more times more helots than there were Spartans, then you're welcome, because that is accurate. But to say that "Sparta was closer to 80% enslaved people" as the OP says, is false.