It's not weird or hard to figure out at all. While the general public were just going about their business and ignoring the dangers up until lockdowns began, people in positions of power (government and business) were well aware of what was coming even by the end of 2019. With full on internal panic hitting by January when cases in the US began to spread like wildfire.
Bob Iger stepped down from his position as CEO on February 25th, 2020. Right as Covid was really starting to tear its way through the US and less than three weeks before lockdowns began. They were being discussed and planned well before they were actually implemented. Iger knew they were coming and jumped ship at the last second to try and avoid a reputation hit, but he made sure to keep his foot in the door and got himself a front-row seat to Chapek's downfall. He remained on as an "advisor" for a long while after (though there were ample business articles that stated he was still effectively CEO in all but name, much to Chapek's displeasaure). Iger then jumped back in after the storm was over.
You don't really need a book about this, it's abundantly clear what Iger was doing.