I surveyed it this week after this anonymous note (https://www.openstreetmap.org/note/5258658) and I confirm it looked 100% like a souvenir shop selling Flemish art and goodies.

The website of Toerisme Vlaanderen refers to this address but there is nothing to be seen apart from this shop.  Maybe they have offices upstairs, with people who reply to phone calls and emails, but if we map it, it will be as an office that is not open to the public.