I thought this rotating house was impossible.

It’s not the same rotating house, but Tom Scott did a video last year that has a great 3D render of the system that designer used to facilitate their build! ▶ this video

Unsure about this particular house in NZ, but there's one in California that Tom Scott did a video on with a very good animation of how its electricity/water/sewage slip ring works: ▶ this video

The owner of a custom rotating house in California cited a similar reason for moving. The video is worth watching but here is the relevant section: "I've had 18 heart procedures. My wife is in perfect health. The odds of me outliving her are zero...We're moving back to Coronado. This is a complex house, even though I think it's simple! For her to try and teach somebody else how to run everything and do everything would be difficult if something happened to me. So we're just kind of jumping ahead." ▶ this video

The part where it shows how the electricity and piping works was pretty interesting. Skip to ~3:00 to see this [1] Patent shown in the video [2]. [1] ▶ this video [2] link