They had the original actors record the lines to dub. They didn't necessarily have the budget to re-shoot the entire movie with them saying the lines in English

They had the original actors record the lines to dub. They didn't necessarily have the budget to re-shoot the entire movie with them saying the lines in English, so that's not work lost. The "AI" here is a program that manipulates their faces to match the English syllables. All I see here is the creation of more work for people to do, not less (dubbing/subtitling it would likely bring a smaller audience).