This seems like uncharitable interpretation of the story.

The OP was kind enough to share this story and give us a glimpse into the project and window of time and I think we should be supportive of that.

In regards to Autodesk - I'm not sure a corporation would even send a letter these days, let alone one written in the positive spirit this one is.

Finally, the OP and Gibson met and buried the hatchet so to speak.