The functionality will be similar to that for back-compatibility with Xbox 360 games. Users insert the Xbox game disc into their Xbox One console to install the compatible version of the game. While players will not be able to access any old game saves or connect to Xbox Live on these titles, system link functions will remain available. Xbox games will not receive achievement support, although when asked about this component, Spencer responded that they had nothing to announce at the current time.

Is it true that can the xbox one x play 360 games?
yes