The post referred to the Sovereign Tech Agency (https://www.sovereign.tech). The problem that the Sovereign Tech Agency is trying to solve seems to be a hard one.

OpenPrinting is listed as a funded project:

https://www.sovereign.tech/tech/openprinting

yet 7 days ago someone who works on OpenPrinting was here and stated:

"The whole printing stack is supported by 4 people, 2 of whom are doing that since the inception of CUPS in 1999. Scanning is maintained by a single person."

https://news.ycombinator.com/item?id=46579361

Isn't this the situation the Sovereign Tech Agency is trying to avoid?

idk, without the sovereign tech agency it would be fewer people, or they would have less time to work on the project. You can't expect the German government to completely fill any need for resources in open source software.

Yikes :-(

This makes me wonder - is there some platform on which people who maintain important (or arguably-important) facilities can post Wanted ads for volunteer co-maintainers?

I realize that the number of people who would actually be crazy enough to browse that platform and answer such ads is pretty small... but - it may be noticeably above Zero.