what's the purpose of eventTime in NotificationOptions of chrome.notifications API?

Question

When creating a notification from an extension using chrome.notifications API, the NotificationOptions: eventTime seems to be ignored as the notification is created immediately which supposed to be delayed by milliseconds set for eventTime. As per documentation:

eventTime
A timestamp associated with the notification, in milliseconds past the epoch (e.g. Date.now() + n).

Although this is not clearly stated that this will cause a delay in creation of the notification by the milliseconds set in eventTime, then what's the purpose of this option?

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I found a similar question was asked some years ago: Chrome notification ignoring eventTime but the above question was not answered there. Instead the solution was talking about the other approaches (setTimeout, chrome.alarms) to delay the creation of notification.