It does matter (although it is possible you simply don't care). This data is used for a lot of purposes, which may include the calculation of your house's estimated worth for taxation.

Most municipalities do appreciate the feedback via https://bagviewer.kadaster.nl. A more accurate public dataset benefits society as a whole.

Strange thing is, they're inconsistent about it. De 1914 building De Vereeniging is listed as 1914 even though they've at the very least added a large conservatory to it since as well as a humongous - and very ugly and cheap looking - backstage area (though that was only this year, so maybe that hasn't ended up in the data set yet).

Oh well ...