I've worked at several large companies via acquisition. Yegge has punched things up a little, but I can translate #6 into what I believe was the original text:

I've worked at several large companies via acquisition. Yegge has punched things up a little, but I can translate #6 into what I believe was the original text: "This represents the new direction for {company}, and anyone who does not wish to align with this new direction should pursue other opportunities". The day-to-day employee at a large company becomes numb to executive emails, as 90% of the time they will be countermanded a month later. A sentence like the above is inserted to wake people up and indicate "no, seriously, this means you".