[ocdtrekkie]

They would've accepted either Sundar Pichai, or I believe even Eric Schmidt, who is now just a "technical advisor" but was the former CEO of Google, and former executive chairman of both Google and Alphabet, would've been acceptable as well.

Kent Walker doesn't make decisions about how Google conducts business, Kent's job is to whitewash it for public consumption. I believe his current title is "Vice President of Global Affairs", which is more or less a PR title, and of course, as others have noted, he's their head lawyer.

Anyone can look up Kent's numerous writings on Google's Public Policy blog, the Senate wanted to speak to the people who actually make those decisions, not just be informed what the decisions are.