Which makes me think of two things; one, they want to get rid of very specific people, people who wouldn't quit on their own. And two, that they can't just reduce staff count without an announcement, because staff count is one of those metrics that shareholders use to determine whether they're staying, buying or selling stocks.
A quiet reduction of staff? They can't hire people anymore, this is bad, I should sell my stocks!
A round of layoffs? They're cutting costs, which will be good for profits, I should buy more! Or sell because I've lost confidence.
Honestly, the stock market and shareholders are not rational.