I did watch the video Alex (and read the article). When I turn RT off I have the following ambient occlusion options: OFF, SSAO (set areas only), SSAO, FidelityFX CACAO and HBAO+. Here are some screenshots of my local RE2 folder as well as my save file.
I don't remember CACAO in the original game (only in Village?) so I am not sure an old save would make it appear. Could it be some sort of config file or registry key from *Village*?
Edit: I also noticed this option was added to Resident Evil 7, so I was under the impression CACAO was added to all three titles with the newest updates (HBAO+ is also still present in Resident Evil 7 btw):