The notification settings for this are borrowed from the same ones used as if the member signed themselves up for a role with a couple of minor modifications.
Example, if the VPE assigns a member to a meeting role in the editor, then the member that was added will get a notification plus anyone that is in the notification list for a member taking a role. This is why the checkbox is in the same group of settings as the other notification settings. I am presuming the same people would be notified regardless of who put the person in the role (the member or someone else), although if the member did not do it, they should also get a notification.
Note that I am thinking about splitting out a separate checkbox for the attendance updates in the editor.
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