Looks like this offer is bound to GitHub projects.
The first reply to the post explains that:
codinghorror
Just to clarify – if your project is on GitHub and you don’t quite meet the threshold criteria of …
2000+ stars
30+ contributors
… feel free to contact us via the form. We’ll work with you.
The purpose of the thresholds isn’t to arbitrarily keep projects away, but rather to ensure that there’s enough critical mass for a solid discussion community to form around your project. We guesstimate it takes about 5 people
actively participating in the discussions each day for your discussion community to “work”.
Additionally, there’s another provision or something for open-source projects that Discourse actually uses to operate, and I’m fairly sure that Go is one of those 
And also, Go qualifies again since its Github mirror has 23K stars. GitHub - golang/go: The Go programming language
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Thanks for clarifying. My fault to not read the announcement closely enough. 
Hello again! Reusing this topic: The forum was down for a while due to a full disk. None of us noticed apparently, and that is bad. Actions are being taken to make sure this does not happen again 
Sorry for the inconvenience, Go(pher) back to your normal business 
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