It would take too long to notify them any other way. As long as he did it the best way he could, it’s really all he can do.
I was on the received end of a similar conversation about 11 years ago. Since it was only 5-6 employees we got a long conversation.
I can’t really think of a better or personal way to do it. I’d expect that they all worked in just a handful of call center locations. Best to get it all done together.