aren't credible because they became so successful that they're now millionaire executives
Yes that's what I'm saying. The statement of two men who stood at the top of the ladder about the man who put them there immediately after that man has died is absolutely not credible in regards to judging how that man treated regular workers. At all.
Jobs could be a bully, it's well documented. Pixar wasn't somehow immune to this behavior.
You've painted a utilitarian, partisan viewpoint: that the cultural and technological significance of Pixar outweighs any negative experiences of staff. The two are not easily comparable. How do you quantify them, what's the denominator? Jobs didn't have a crystal ball, he couldn't know Pixar would succeed. What was his calculus? How did he determine the trade-offs between success and bullying? Finally, cultural/tech significance is most certainly possible without putting staff through negative experiences.
They make that choice everyday they chose to keep working for it.