From reading the article he would have been fine if they assigned him as the manager to train them. But they took over his roles, required training and didn't report to him in any way.
I'm guessing they probably worked on different teams with their own managers. There is a lot of overlap between purchasing, supply chain, manufacturing, design, etc.. We're talking about hundreds of people.
He also wasn't a manager to begin with, that requires it's own set of training, but we are getting way way in the weeds here to even be talking about this all on one person's point of view. There are so many factors that go into org structures, interviews, cross team collaboration, etc..
It's easy to feel slighted when you don't have a full picture. What we do know is the work pace is so frantic that I wouldn't attribute these things to malice immediately. Just a lot of people trying to do a lot of things in a short amount of time.
