https://www.bbc.com/news/world-asia-67354709 also quotes "South Korean news agency Yonhap", and quotes statements from "the Donggoseong Export Agricultural Complex, which owns the plant" - and gives "In March, a South Korean man in his 50s suffered serious injuries after getting trapped by a robot while working at an automobile parts manufacturing plant" as additional detail of the previous incident. (That may not be enough to find earlier articles, or maybe they're just eclipsed by the current one.)