Nah, OpenAI Five directly interfaced with the game through the bot API. It did have superhuman perception, they just artificially nerfed its reaction time to try and counterbalance it.

https://www.reddit.com/r/DotA2/comments/bf49yk/comment/elauw...

Maybe I'm remembering a different game ai accomplishment, starcraft perhaps

now that you mention that specific nerf, I remember that being a big one