https://www.gamespot.com/articles/xbox-one-x-backwards-compatibility-feature-expands/1100-6457038/

Xbox One X enhancements are most often discussed in regards to Xbox One games, but a select number of Xbox 360 games also receive significant improvements when played on the high-end console. Several more 360 games have now received Xbox One X enhancements, and Microsoft has introduced an optional feature to let you disable that visual boost.