Fudging the numbers looks like the least painful option, so I wouldn't be surprised if that's what they do. (Or have been doing) Except I'm not quite sure how they would pull it off because it would require collusion from branch staff who would presumably need to cooperate with overstating the numbers. Tricky.
In any case, no matter what they decide to do about publishing or inflating the numbers, they can't hide the number of congregations figure. Congregations are publicly listed and they can't close congregations without it being public knowledge. So congregation numbers are the key figure to watch. Congregation numbers have already started to decrease in the United States and much of Europe. Watch that space!