It looks like the source repo is at https://github.com/google/fonts — has he tried a pull request? If not, maybe we can help with updates until they make it friendlier for less-technical creators.
Same for many others, e.g. Montserrat or many of Vernon Adam's designs. That being said, I find the redesign wonderful and long overdue. Maybe now they'll find the time to update their collection.
For example, I found what appears to be the home page of Monsterrat (http://montserrat.zkysky.com.ar/en) but it directs me to Google Fonts. Similarly, I searched for "vernon adams fonts" and I don't see what looks like a canonical page for them.
Most of the fonts are of the latest version though. Fonts not included in Google Fonts, like Linux Libertine/Biolinum, Aileron, and Heuristica are included.
If you don't mind the performance hit, you can use it.
[1]: http://brick.im
EDIT: As for where you can find the new versions of the fonts, you can browse through brick.im's Font repository[2] and click on the `SOURCE` files.
The new Montserrat versions are located here: https://github.com/JulietaUla/Montserrat/
[2]: https://github.com/alfredxing/brick/tree/gh-pages/_fonts