Although the tool is internal, a lot of information about it is not confidential.
As the team had to collaborate with the VSCode team, we got clearance for sharing information about it. The screenshots in the article were posted publicly on GitHub (in vscode issues). You can also find screenshots in https://research.google/blog/smart-paste-for-context-aware-a...
More generally, a lot has been communicated on developer infrastructure at Google.
I'd love for more screenshots should anyone have and can share. I still don't get a great picture of how it's running in the browser and I find UI choices fascinating. But I imagine I'd need an NDA to see the settings/options :')