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By the character assassination he probably means he's depicted as an asocial eccentric genious, while by all accounts he was a fairly normal charming person.

And regarding his accomplishments, the movie is also completely wrong. His Enigma decoding work was of course very valuable, but as others mentioned here heavily based on earlier polish efforts, and teamwork, not just him. It's also portrayed as an early computer, and is then said that he was at the basis of modern computers. This is bullshit, that device was in no way close to modern computers, and he was at the forefront of theoretical computer science. Look up the turing machine which is a theoretical device that can compute anything an actual computer can compute, but has very simple properties making scientific/mathematical analysis of what computation is, what is computable, ... possible. Which is an incredible achievement, would be nice if they mentioned that in the movie...

(and also the entire story is just fantasy around the work that happened for enigma. His nemesis in the movie that was against building the machine also never existed etc...)

The only thing truthful about the movie is "There was a gay computer scientist named Alan Turing that played an important role in decoding the enigma encoded messages during the second world war", and all the rest is just invented drama that's not in any way based on reality. He wasn't some autistic genius, there was no nemesis, he didn't invent computers, nor was the enigma decoding device related to computers, etc...