If you completly ignore that F2P games obviously have much higher number of registered users (especially in the east where botting is even more prevalent), and that total of accounts created is completly unreliable and irrelevant to even guess the ammount of either active or concurrent users, then sure, neither of us can prove each others assertions.
The big difference is that if you don't ignore those things, my assertion is much more likely to be true.
I can't even find the official report from Nexon on DFO's total number of accounts, only "copy paste" reports that don't link to it.
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It was over 100M created accounts (including trials) in December 2013.
https://bnetcmsus-a.akamaihd.net/cms...0922506769.jpg