Here is the info copy-pasted from my reddit post.
What do we have now?
I have hidden four codes abcd for access to my S.F.T.E [possibly acronym for Society of Flight Test Engineers]-dr bon ami [good friend] code a one zero zero one
"I have hidden four / codes 'abcd' for access / to my 'SFTE' - DRBONAMI / codes / ONE ZERO ZERO ONE"
User unhi apparently gives confirmation that this is indeed an ARG, but the first and easiest code found is not yet completely cracked. He also found another potential code and did some detective work.
It seems to revolve around pizzas. There is one of the pizza-heavy secret rooms. There are other secret rooms containing pizza.
How can you help?
NOTE: involves cheats, so not everyone will like it!
We need to find the other 3 codes, and any potential clues around. I’m on chapter 8 or 9, so I probably missed a lot. If you feel like exploring secret rooms, this is how I do it:
- Open options panel -> keyboard -> advanced -> enable developer console.
- Open the developer console with whatever key you have it set in they keyboard settings panel of the game.
- When starting up the game (every time you start it) type in console “sv_cheats 1” to enable the use of cheats. This command by itself does not alter your game experience.
- Type in console “bind n noclip”. You can chose any key you want instead of “n”. Pressing the key will toggle noclip.
Be reasonable with noclip! Don’t cheat, don’t spoil yourself, don’t get stuck; quicksave before exploring, as some areas will instakill you if you noclip there; going too far crashes the game.
Of most interest are locked/broken doors that apparently have rooms on the other side. You can also try inaccessible catwalks and observation rooms, but be sure not to go somewhere that you should be later on in the game and spoil what lies ahead.
I will update this post as new information arrives.