OpenAI read the paper and changed the model?
BTW the time stamp of the model is easily falsifiable.
We are talking about a billion dollar business opportunity so expect foul play all along.
OoenAI sells GPT 4 but it's only GPT 3.5 because of lack of resources.
Or more sinister, they knew what the author was about to test and gave him the inferior model so it could be easily debunked.
It's pretty easy if you assume people are checking the exact same quote.