Not quite the same level but I remember before gen 4 game consoles were announced, for a while the NDA hoops we had to jump through and the care we had to take when discussing them internally was intense. For a long time we just called them "gen4a" and "gen4b" (a legacy that still lives in our code base to this day), and you weren't allowed to verbalise which one was which. This was followed by more code words, so you then had to remember which code name matched up with gen4a and which one was gen4b. SDK and firmware drops were strictly locked down of course, and we had to hide the dev kits when any kind of video crew or photography was taking place around our work areas even though the kits were pretty much unrecognisable and even if it was for an internal purpose (but that's to be expected, anyway). Also you could not stack one particular kit on top of the other one because it was known to overheat faster than a pug in summer.
Oh yeah, I was in gamedev before this and NDA process back then was quite involved. These days with the ability to run on production hardware that's a lot less restricted.
I'd say that SoC vendors are a bit more strict about NDAs vs GameDev where it was pretty wide knowledge who worked on what. Once you were in the industry there were very few secrets given how small it is.
