Either Lucas botched it or it’s “a deliberate artistic choice”. Or Lowry botched it and Lucas just didn’t care.
Lowry have received a color “corrected” scan, they didn’t touch the colors themselves, that was done at Lucasfilm
They didn’t lucas just gave them a print that was corrected in a machine without actual care. He sold out a long long time ago in his home in California without giving any proper love to his films.