I appreciate the "fix-it-twice" attitude implied by the RCA promise (Root Cause Analysis for those who also had to look it up). Also, consider recognition and restitution for the unnecessary work you created for the NumFOCUS director, a NumFOCUS lawyer, and the SymPy maintainers.
A $25k donation to NumFOCUS would be a good start.
If you are willing to talk about what happened publicly, I'm starting a podcast/video series to discuss business and open-source. This would make an interesting conversation. Perhaps we can turn this into a positive to raise awareness and inspire better behavior in the industry? Ping me.