The investigation "did find evidence of mistakes and errors of judgment. In light of these findings, Tom has submitted his resignation, which the company has accepted."
That seems entirely guilty (if you want to make it into an issue of guilt)to me. github did have "mistakes and errors of judgment" serious enough that Tom resigned.
There is a difference between mistakes and errors of judgment and "gender-based harassment or discrimination". Someone may be harassed for a different reason than their gender. For example a personal vendetta or abuse of power vs. systemic discrimination against women (or men or other).
Github admits that there was wrongdoing by Github executives, but denies (without details) that any of it was the specific kind for which Github would be legally liable. Its not entirely surprising that people give more weight to the part which constitutes a statement against interest than the part that is clearly self-serving, in the absence of supporting details.
That seems entirely guilty (if you want to make it into an issue of guilt)to me. github did have "mistakes and errors of judgment" serious enough that Tom resigned.