Answer

Eric de Kuyper grew up in Brussels in the fifties and Dutch was very marginalised then, because of a lack of language regulations, little education in Dutch and a bad image. In those days, French was still the language of culture par excellence in Brussels. Just about all communication was in French and its influence was very strong as a consequence. So even though de Kuyper comes from a Flemish family and speaks Dutch at home, the context he lives in, is French.

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