If you want background on the material in question here (nitinol), The Verge had a good video explainer about the material and a bit about how the “space tire” aspect will work. It’s really a fascinating video of you’ve never seen the metal in action. I can see why it would be chosen for the environment on Mars. I’m not sure if it would be better than air tires on Earth, but for the low atmosphere environment on Mars, it makes more sense.

https://www.theverge.com/2021/3/17/22334611/nitinol-metal-sh...

https://youtu.be/Pn-6bGORy0U