Community over code is arguably not the most grammatically correct way to express this. Community by itself is a lot of fun, but in the context of the ASF or other software non-profits, it doesn’t get much done. The code is the primary giveback from the ASF and other organizations (Mozilla, FSF, linux, etc.).
But the ASF’s view is that the community is fundamentally more important. There’s no point in having a project without code, yes. But we won’t support a project with great code if there’s no community, or if the community is a monoculture.
The essence is that a community of developers is more likely to continue maintaining a codebase than either an individual, or a monoculture of developers from only one source / employer.