The tablet was unearthed in Georgia (country), not Georgia (U.S. state).
“The Iberian Union is a historiographical term used to describe the personal union of the Kingdom of Portugal with the Monarchy of Spain, which in turn was itself the dynastic union of the crowns of Castile and Aragon, and of their respective colonial empires, that existed between 1580 and 1640 and brought the entire Iberian Peninsula except Andorra, as well as Portuguese and Spanish overseas possessions, under the Spanish Habsburg monarchs Philip II, Philip III, and Philip IV. The union began after the Portuguese succession crisis of 1580 and the ensuing War of the Portuguese Succession, and lasted until the Portuguese Restoration War, during which the House of Braganza was established as Portugal's new ruling dynasty with the acclamation of John IV as the new king of Portugal.”
Note the "Download country names" button, and the "Display results in" language toggles.
In some cases name changes are political so I could see there being resistance to going along, if the politics doesn't align.
From the Wikipedia article: "Some locals referred to its construction as 'the devil's work'. A local minister warned that "occult groups" would visit the site and that a sacrifice was imminent." Even worse: "Kandiss Taylor, a candidate in the 2022 Georgia Republican gubernatorial primary, called the Guidestones "Satanic" in a campaign ad"
With local culture this backwards, you can't expect something like this to last for long.
As an ESL speaker, my first impression was "a tablet computer displaying unknown language found in Georgia, US". Feels like some extraterrestrial technology.