That could work. 15 managers doing 10 1:1 meetings each isn't so hard. It can get tricky with people being on vacation etc. But very possible and normal.
That's not so good for the people remaining, or even those laid off but later in the queue. Once the first person gets laid off, everyone will know it's happening and be wondering whether they're included. You're just dragging out the suspense over the hours or (more likely) days those meetings take place, rather than getting it out of the way in a few minutes. That's probably worse than the dubious joy of a personalised message about your termination.
(Though, here in the UK, redundancy procedures can take weeks, so a few days is not much compared to that.)
What if their direct manager was also terminated? It could result in a manager's manager having such a large cohort as it to take several days while employees wait to see if they're fired or not (word would get out immediately).
This is how I have seen it done. You end up with managers firing people they do not know, and employees getting 15 min meeting invites and knowing what it means. But it’s much more compassionate and human.
I was at Atlassian when a major product was cancelled which was based in the Austin office and MCB flew out to Austin to deliver the news that some would be laid off and others reassigned. I think a town hall over video chat would have been fine.
Hipchat was a success, which is why Atlassian purchased it, but Slack leapfrogged it and Stride was too late.
Not doubting the role that support plays for Atlassian. Just highlighting how I witnessed MCB handle a similar situation 7 years ago, by flying to Austin from Australia to deliver the sad news. The article makes him sound heartless or cold but that wasn't my experience. That being said, an async video message is a weird play.
Well they certainly shouldn’t tell everyone that a bunch of people are being fired and then to just wait and sit around and see if you get the email of doom.
I swear there was a post not to long ago about a company that laid off a lot of employees in a live meeting, and it went badly, and people in the comments were saying "a prerecorded video would have been better". The duality of Internet forums, I guess...