I doubt the numbers are made up. But I doubt this is true: "So still no slowing down yet "
The simple truth is that minors across the spectrum have been encouraged to get baptized. I, nor Watchtower, has exact data on how many youths they have, how many can be coerced to be baptized, and how many that will leave for next year as they get slightly older and feel slightly more pressure to follow suit.
I would also be interested in the number of those that leave the religion and those that die. If Watchtower is still growing, it is very near it's peak. Don't worry, the slow decline has either started or soon will.
As mentioned though, it is possible that these numbers have gone to fiction. Then they are already on the decline.