Apple recently introduced rdma support in mac os. They are probably trying to push those people buying the 512gb configuration towards buying more of the 256gb configuration and clustering them together.
Weren't 512GB models selling like hot cakes to the complete surprise of Apple? Wait time was up to 3 months last time I checked. Glad I got mine last October.
A consumer computer company is not going to push people towards building a miniature HPC cluster. Closest we'll ever get to that is multiple GPUs for video games.*
*Nvidia is no longer a primarily consumer company, so all the other GPU stuff is no counterpoint