No, they didn't. When an artist draws a picture of Manhattan, they draw steam coming up from the streets and no utility poles. They don't need to know anything about the buried power infrastructure or steam pipes. It would probably be worse if they did; the point is to communicate the conception of the space. It does not matter if steam is coming up on a street where it shouldn't; they drew it to say "this is manhattan", not to depict a component of the infrastructure that exists off-canvas. It does not matter if businessmen are walking around at 3pm when they should be at work if the point is to indicate that business is happening. The kayfabe is more important than the reality.

This is for a computer graphics conference, not an architectural conference. The point is to generate more-plausible interiors instead of copy-pasting the same layout. They are generating the feeling of more realistic spaces. You're the one coming in and saying that they don't know what they're doing, and trying to simplify an art into something you understand.