Why on Earth would they do that? Nothing wrong with the 2020 release, and I can't imagine you're whining about a different release of Inchon 3 years after the 2020 version?!
It’s a slight difference in quality. Honestly it’s hard for me to tell the difference since I compared a few tracks from both releases. This release sounded like it was made by perfectionist. Nothing wrong with that but I probably would have wanted longer to release it.