Changes to Military Law were initiated under Obama, and are mostly procedural. The major changes with offenses are to make them more PC - easier on sexual deviation, harder on domestic violence.
Linked at your link: https://www.militarytimes.com/news/your-army/2019/01/15/heres-what-you-need-to-know-about-the-biggest-update-to-ucmj-in-decades/
“In 2016, Congress passed a new Military Justice Act, calling for a review and reorganization of the Uniform Code of Military Justice, the set of rules and regulations that dictate criminal offenses for service members and how they are adjudicated.
Among the changes are new definitions for adultery and intimate partner violence, and a specific law against sexual relationships between instructors and trainees.
The Military Justice Act of 2016 called on the services’ judge advocate general corps to take a big-picture look at criminal justice in the military, updating some rules and definitions, while changing up some proceedings to streamline processes or to get them in line with civilian federal courts.”
thanks!