Sure, there are alcoholics in the past. But sitting with the intention of sounding drunk, interspersing deliberate typos with "pour another drink" and "take a sip" because someone thought that was a cool premise is weird.
It's one thing to write drunk, it's another thing to get drunk to write about being drunk
He wasn't drunken rambling though, he was getting drunk to do it. I think there's a real difference in message there - as much as it was probably fake.
It's one thing to write drunk, it's another thing to get drunk to write about being drunk