I shared that link in good faith, not aware of your specific use case. I still think it's for the better that black does not allow tabs, and that your fork is a good solution for shops that need tabs for an existing code base.

Black encourages the Python ecosystem to settle on spaces. There should be some friction involved (more than a switch) to use tabs, otherwise we're likely to see new code using tabs too.

$0.02 and all that.