Pure marketing (propaganda) to get his stock to rise. Take a look at the pics, the front view "after" pic was taken with him much closer to the camera making him look much bigger.
Taking a pic right after a workout can make you look even bigger and combine that with the low weight he was carrying before, it's quite easy to make it look like this guy has turned it around.
Fighters, can drop or gain 10 pounds in a day or two for weigh in, so 25 in a few months is very possible. Good job of timing it.