First, because I'm not naive and know that CEOs don't get large bonuses and stock grants for doing stuff like that, particularly not in the US health insurance industry.
Second, we know that since he started there they began programs like using AI in a fashion that had a preposterously high denial rate, and actively hurt elderly people.
this case, and others like it continued to happen during his tenure.
Finally, a company wouldn't do a program like that without mentioning it, since it would clearly make them a more appealing insurer.
Even if he didn't put the policies in place, he's still responsible for the conduct of the company under his supervision, and there's no indication he did anything other than act like what you would expect from an insurance company CEO. Maximizing profits by denying healthcare.
They're both bad, but at least the hospital provides a service for its money. The insurance company makes all of its money finding ways to not pay for services someone else provides.