In 2001 and 2009 I remember hearing about layoffs where they had a big (in-person) meeting to announce the layoffs. I seem to recall there were two ways: either you have two simultaneous meetings, one for the survivors and one for the axed; or you had one large meeting to announce them, and then people went back to their desk to check their email to see if they were affected. I'm not sure that announcing it over a mass Zoom is any different than a mass in-person meeting.