I don't see how jq being abandonware is relevant to a different tool with a different feature set.

See, this is exactly what a blog post could explain. It's relevant because people who need a tool that hasn't been abandoned are looking for an alternative. The reducers in fx could be a replacement for jq in many use cases, and their feature sets overlap quite a lot.

Looks like the jq repo just got some new maintainers and has had ≈20 commits over the last few days.