It might say something about countries with large numbers of unassimilated minorities (in this case mostly Muslim).
That aside, pg's point was that even in Holland (which he uses as an example of a "tolerant" country), there are negative consequences to actually saying "can't say" things. E.g: Many things about Islam and its prophet are (in practice) "can't say"/undebatable things (without assuming a serious risk of getting killed).
