Antonius hasn't 'Signed' for iGame. He's doing this one exclusive promotion only so this article is pretty misleading.
iGame own 24hPoker & NoIQ on the IGT network too, they've been around a long time and are definitely a well respected and reliable company thus far. Fact that they're based largely in Finland might have something to do with the fact that Patrik is doing this promo.
Better article on the matter
here.