It doesn’t say anywhere in that article that leftists are trying to censor that scene, John just mentions other actors he knows personally who suggested that he cut it out of worry that it would be viewed as offensive. Not because people on the left actually called it offensive or called for it to be censored. So according to that article, nobody tried to censor it, just suggested that Cleese cut it, and their reasoning wasn’t because it’s offensive, but because they were worried that it might be considered offensive. It also mentions in that article how religious groups were the ones actually trying to censor the movie in the past. Cleese didn’t want to cut that scene, so he didn’t. It wasn’t at risk of being censored considering he’d never had any intention of cutting it and the choice was always his to make.