Having seen the video, the creator is very upset that Alita was subbed at all, and has plans to have a Alita Sequel banner flying above the Oscar ceremony. The fandom for the film is odd, to say the least.
Also, his analysis only focused on the use of CGI, even though visual effects is not only about CGI. He has a odd barometer on what he considers horrible. When I saw the film, I didn't notice any of the "mistakes" he talks about (likely they were fixed after the trailer was released). I was invested in the story, hoping that Scofield can make it across the battlefield to complete his mission.