is this tool still maintained?

[bkielbasa]

No description provided.

[rsc]

You say "still maintained" as if it was ever maintained.
The README.md says:

rf is an experimental refactoring tool. It is very much a work in progress.
rf is incredibly rough and likely to be buggy and change incompatibly.

I use it regularly, and it works, but the README is also still accurate.
At some point we may turn it into a maintained, supported tool,
but at the moment it's not, nor has it ever been.
If it is useful to you, that's great, you're welcome to use it.