Can you please summarize his argument?

You mean "Listen to [someone who started on Wall Street at Lehman Brothers, joined PayPal in its earliest days and worked alongside Peter Thiel and Elon Musk, and eventually became a venture capitalist in Silicon Valley] argue why AI probably isn't a bubble".

Funny how this different framing of the exact same person provides a completely opposite expectation of their incentives behind commenting on whether AI valuations are a bubble.