It's mostly procedurally generated, so they might be making the case that it's just a rough representation of the terrain and not specifically a representation of the building. I could see a judge deciding that's bullshit, but it certainly would be a slippery slope to declare it illegal to provide accurate 3d maps of a city
I think for things like GCHQ, which the UK government is very touchy about having accurate records for, the right thing to do would be to replace it with a much cooler set of buildings.
