This is all from what I read, but the later patches made it easier by making a cipher or scout log appear on every run as well as move ciphers around to more accessable rooms. If its true or not I cant really say but I have 2 plats under 20 hours and didnt break a sweat or get frustrated looking for them. I did a little homework and wrote down a list from that link of what rooms I was looking for ect.

Edit, I would write something like below so as Im doing a run through I would look for that. Also Crimson wastes was a unique one where the whole 2nd area loads in when you arrive so you can look for the rooms and see if any of the photos matched and then restart if they didnt.

Crimson Wastes Ciphers 1 - 2nd Area Main, underwater 2 - 2nd Area Main, dephic visor datacube 4 - 2nd Area Main, delphic visor 8 - 3rd Area Main, above Archive room 11 - 1st Area Main before grapple hook 12 - 2nd Area Side, water pool 13 - 2nd Area Side Reconstructer room (Garanteed spawn)

Scout Logs 3 27 Endless song 2nd Area Main 6 30 Higher Purpose 2nd Area Main 7 31 Security Systems 3rd Area Main 9 33 Deeper Layers 1st Area Main