It was a moderator on a dutch ‘stop gambling forum’ which also seems to be a therapist or whatever an ‘expert’ in this field is called.
Seems to me that he’s talking about players from the Netherlands, but I am glad you share the scepticism about the figures.
However, I will not go and ask it on the forum… ‘hey, i am a wannabe casino webmaster, how many of you get addicted?’ is slightly inappropriate…