It was not released under his name. It is in Google's own googleworkspace Github Organization, alongside 57 other similar projects that consume from the same API.

The organization hosts repos shown here: https://developers.google.com/workspace/drive/api/samples

> Google spends countless of man-hours to make sure whatever product they put out is as good as possible

That's 100% not true for those kinds of projects. There's plenty of "not officially supported" projects in Google's Github.