Seems doubtful. His entire time at Google was doing project management stuff, so that is probably where all of his skills lie.

Can anyone with access to google3/ tell us if there is even a single commit by sundar@?

No, you can only access google3 by default if you are a T ladder FTE. This rules out almost everyone who isn't a SWE, SRE, PM or other affiliated technical role. There are exceptions, but ... they're exceptions.