I would really like to read the CLA, but this:

However, any distributed version that includes your contribution remains properly licensed under the project license(s) that applied when you contributed.

Seems like a green flag. If followed through in the CLA, it means that any version released under AGPLv3, that contains any contributions, will remain under AGPLv3. So in theory Fluxer could at some point change the license, but everything up until then would remain free and open source and available to, for example, continue a similar project. Furthermore, as long as the code contains contributions that were made during the AGPLv3 days the code will remain under AGPLv3.