https://beta.openai.com/playground
You found try something like "The full name of the person with username skywal_l is"
(the answer given is "Skyler Wall")
You found try something like "The full name of the person with username skywal_l is"
(the answer given is "Skyler Wall")
Even for OP it doesn't work, it just guesses "H* Boppre" (with a different name liks Hans, Horatio, etc. every time) which just so happens to be close enough to their actual name because their nickname is their real surname.
Also keep in mind even obvious / common things may not be indexed, but openai gpt3 will rather make something up than say it doesn't know. So if you get randomness, maybe it just doesn't know.