Not my choice, in fact, it is essentially a follow-up of changeset #136006447 where the user expanded the name.  The user modified name:fr, name:nl and the French part of the name tag, but failed to change the Dutch part of the name tag.  This caused a validation problem.

I agree with you that if the name on street signs is the short version, we should better reflect that on OSM.  This means that changeset #136006447 was not reliable.