The more I read about it, the more I think this story is nonsense ("cucumber time"?)
And the comparison with the dutch princes who do not receive a dotation and do real jobs I am not sure about either. Would Laurent be able to do a real full time job without dotation from the government? I have doubts. Where would he have to work: the Flanders? Wallonia or Brussels? For a private company or in the public sector? Either way the press or the Belgians would always criticise e.g. by saying he got the job because he is the son of, or they had to find him a job because he is the son of and not in his own right. I may obviously be wrong but this is my feeling about it.