Single handedly? I'd say the the people using (or forcing others to use) the models, therefore justifying the need for them, play a part in it.

Yes, he is solely to blame: https://www.mooreslawisdead.com/post/sam-altman-s-dirty-dram...

He said/implied that we would have shortage either way (without data center buildout, but everyone who wants access to LLM does private/local inference), which doesn't sound far fetched.