Training is far more broad than labeling
"People training OAI AI" has a colloquial meaning of "People working at OAI"
So the headline is built to imply:
"People who work for OAI got fired for using AI to do their job"
When a non-clickbait headline would be
"3rd party workers contracted to distill their human knowledge fired for using AI instead"
Not nearly as "clicky"