Here is this person's commit history for the last year for additional context:

https://public-001.gitsense.com/insights/github/repos?q=auth...

They do appear to contribute regularly enough (relatively speaking) and based on some of the busfactor metrics, they are the sole maintainer or main maintainers for about 50 files.

And if you look at their one line change commits, they do seem to be valid:

https://public-001.gitsense.com/insights/github/repos?p=comm...

Disclaimer: I'm the creator of the tool for the links above