I had the same thought, and while this is a complete guess, it passes my sniff test personally. It’s possible that when this setting is not enabled, those wake events are not coalesced into hourly wakeups, but instead happen arbitrarily throughout the night. That would immediately lead to the behavior described.
Batching isn't mentioned anywhere. Do you have a positive reason to think this, or is it just the easiest hypothesis (besides a typo) explain what the author wrote?