I'm not convinced, and neither is Sam Altman himself [0]. Also, if that projection holds, and that's a big if, the purported breakthrough would cost 10^6 times as much as GPT-4 took to train. That's over 100 million dollars [1] times a million. That adds up to over 100 trillion dollars, in the ballpark of four times the GDP of the whole of United States.

[0] https://www.wired.com/story/openai-ceo-sam-altman-the-age-of...

[1] https://en.wikipedia.org/wiki/GPT-4#Training