This is pretty accurate I would say. Although, Go is more popular outside of Google than inside it and the original dream of "Replace all Python and most C++ and Java with Go" is laughably dead. Google used to require SRE teams to explain why they weren't using Go for new projects and they abandoned that because it was ridiculous and no one took it seriously.

There are quite a few internal projects written in Go, but it feels like any time one of them gets big enough to matter, someone ends up reimplementing the important parts in C++ for performance reasons.