Worked in Bruxelles and Braine-l'Alleud for a few years.
It's an odd place, generally folk are nice enough but the French and Dutch speakers do hate each other. There are even areas where the French can't buy property and where if you speak French you will be ignored (English is fine the Dutch speakers all seem to speak it fluently). Unions and tax are a big problem there though.
This story though is just about the Brits who work for the EU. Quite rightly after we leave they will become a foreigner and cannot therefore work for the EU, hence Junkers request to make them Belgium.
Rather smacks that the EU has not planned that it could loose a load of its workforce!!