I have lived in zeewolde near the place of the datacenter, I can tell you that its massive, especially considering how small the country is and how densely populated it is. Historically, flevoland was created for the express purpose of creating fertile land to farm on. The only reason they didn't build it on industrial land was because of anti-competitive deals with the zeewolde municipality in order to reduce the land usage costs. Also, there are no big supermarkets in the Netherlands.

From an american perspective I can understand that this doesnt make alot of sense. but zeewolde is just shy of 60km from schiphol airport. Distances, building sizes and infrastructure and everything else has adapted really well to this dense country, this datacenter is not.