Its native, just like a decade old and done by Pacific Title.
Just like those Star Wars 4K discs were done around the same time by Reliance Mediaworks, AKA Lowry.
Have no idea why they sat on it for so long.
Must be a Lucasfilm thing.
Raiders was done in 2011-2012
Star Wars was done in 2012-2013.
Only for both to be released a near decade later.