I think this is a parallel usage. At the last SV company I was in, "all-hands" was the set name for a recurring meeting (scheduled way in advance) with a set it

I think this is a parallel usage. At the last SV company I was in, "all-hands" was the set name for a recurring meeting (scheduled way in advance) with a set itinerary similar to what's in the article (announcements, staff anniversaries, etc). They were never used for sudden announcements or bad news.