If you read his comments closely, he was specifically talking about investment bankers. He talked about how it was hard to train junior bankers on deal making if not face-to-face. I think he used the term "apprenticeship". Even in the era of unlimited voice calls, emails, and video calls, as I understand, most M&A and IPO deals are still done face-to-face.

For the investment bank, many of the employees work in New York City and use a train (or bus) to commute. That is pretty low carbon intensity.