My guess is it was sent by someone with authority to set company-wide policy (possibly somebody in the CISO's office), but didn't run it by legal counsel first, and ran afoul of some arcane labor regulation. At that point, saying, "umm, we didn't intend to send that" becomes the path of least resistance.Hence... "Briefly" Probably got some feedback and didn't want to piss of the master.
I doubt Bezos squashed it, though, as he makes the honey badger look like a worrywart. I doubt he'd care about negative feedback on a corporate policy.