For a lot of objective fans, Djokovic was the GOAT when it was 22-21 at the end of 2022. 6 ATP Finals to 0, NCYGS (which is nearly as strong as a CYGS for a lot of fans), nearly double of weeks at No1, double career Masters, positive H2H, over 50+ more wins against top-10,... all these records make up for that 1 Slam difference. I'm sure you can easily find some online polls from July-December 2022, and hear some podcasts from TennisTV, tennisChannel, ESPN,... the large majority were already crowning Djokovic before he won AO this year.