Can it run Cray-1 software? The architecture is completely different. I coudn't get that from the article. It seems like a large cluster of Macs arranged superficially to look like a Cray-1.
https://github.com/andrastantos/cray-sim
I imagine that they could run that on top of them and run official Cray software. The instructions are for Linux/Windows, but I bet it runs in homebrew just fine.
https://hackaday.com/2023/01/23/running-cray-os-and-unicos-o...
Mine is a lot smaller, but it can run Cray workloads at full speed.