The problem with this kind of trial is that it's all about personal motivation, and personal memories. Insight into motivations is difficult at the best of times, and there is little way to prove them.
Memory is worse. Human memory is fallible. Especially in cases of conflict, we unconsciously edit our memories to cast ourselves in the best light, and our adversaries in the worst light. As a personal example: We have a couple next to us who are a$$hole neighbors, who have (imho) deliberately sought conflict with us multiple times. At one point, i went back to the correspondence we had on one issue and...it was very different than what I had "remembered". They were still jerks, but my memories had morphed to make things far more black-and-white than they actually were.
So Musk saying what Altman wanted, and Altman saying what Musk wanted - you can believe as much of it as you want, but likely very little of it is accurate. Remember that there are three sides to every story: What person A remembers, what person B remembers, and what actually happened.