"Emails like this are usually riddled with corporate speak so I'm going to
give it to you straight."
"So we have made an extremely tough decision: we plan to part ways with
up to 336 people from across the company."
It's more like "our incompetence has forced us to fire you but of course we, the incompetent ones, will stay; think of this as your opportunity to find a better company without incompetent management, good luck with that".
None of the people who got fired are like "OMG... Jack is such a great guy for firing us without so much fluff"
If anything is just good for him, and press, just for him, if anything his message basically say "We want a strong twitter and you are weak".
Corporate speak usually refers to deliberately obfuscatory language, and I see none of that in what he wrote.
Often the process then more broadly resembles a farce, with managers trying to protect their mini-empires by sabotaging others. Giving an explicit number seems to indicate that Twitter has a clear idea of exactly what they're trying to do here.
Later on in that job they handled it even worse, with a gradual attrician over several weeks of people suddenly finding out they no longer has a job, and would be paid their notice period. No idea how things went from there, since that was when I jumped ship.
(And hello! I still find it a bit odd when I see people I know commenting on Hacker News.)