Actually, they were invented by the Spanish Empire in Cuba during the Ten Years' War. They utilised them again in Cuba with Valeriano Weyler's Reconcentration Policy of 1896. This policy is where the term Concentration Camp gets its name from/ first coined.
www.smithsonianmag.com/history/concentration-camps-existed-long-before-Auschwitz-180967049/

It didn't say Hitler started concentration camps.
It says It didn't start with Hitler.