They didn't hire an Korean studio, they hired a team of 8 freelance Korean animators. The lead animator having never been credited in a professional video game before. The lead animator also said in an interview that he was working part time on E33 remotely while still full time at his day job in SK. It's not like they found an established animation studio who was OK with redacting their studio's name in the game's credits.
I think the confusion came from an article earlier this year where a website reported that the combat animations were done by an "eight-person Korean 'gameplay animation' team" which people have taken to mean like a Korean Pixar or something bigger than what it was.
I mean it's still not "smol bean indie devs" like some people believe but they also didn't have the budget to get an actual studio with history and priors