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Like my forefathers through more than 1000 years I am part of the Danish people, live in the Danish state and speak the Danish language. Nothing could be more simple. So I must admit getting easily confused when I look abroad.
Many people, including certain historians, would describe this person as Belgian. So, yes, calling this person a Belgian would be, let's call it, "acceptable". However, would not work for some people. For example, Willem Van Oranje used to live in what we now know as Belgium. Still, he is actually the founder of the reublic of the Netherlands, and should therefore be called Dutch and not Belgian. A few centuries ago, people would have been referred to using the county, province, or region they lived in, such as Brabant or Holland, and these were at one point or another part of The Netherlands (which encompassed a large part of Belgium).
I hope this helps. I invited the person who provided me this info to come and take a look. He's a teacher, so I'm sure he'll point out any mistakes I might have made in my translation. ;)))
I tend to feel that it will not be acceptable in my article. At least not as a title or subtitle. I might mention in the article that a later, more romantic and more nationalistic age had given him that name.