Building datacenters plays to his strengths. It's a good partnership if he can stomach it.
I would think that stomaching Musk would be the hard part. Just goes to show how compute-constrained Anthropic is at this time.
He literally did a Nazi salute on stage, twice! Check the video, and tell me what you see.
edit: https://giphy.com/gifs/elon-musk-nazi-salute-8W0ItVv7T1kRdwb...
As long as it keeps Altman awake at night, it's all good I believe for Elon.