It’s vibe coded but it’s not slop. There’s a lot of human input here. So either the author overlooked the elevation issue or it was a deliberate decision, but in any case you can’t just pin this on “LLMs don’t understand isometric 3D”.

I've been busy with a rendered isometric map recently and I figured this is something Opus can help with, but it was near useless at understanding isometric designs along with elevation changes. It kept me busy for days.