It's more like affirming specific positions (pic related). You can get away with being leftist and embracing a lot of specific economic positions incompatible with it as long as you also embrace certain positions 24/7.
This is why Contrapoints got fucked for not walking the party line with the nonbinary thing by mistake. Or why some tankie furry got screamed at by that community for showing up at a commie party event where they were pro Russia (but also anti-US Imperialism and anti-interventionist). Or why JK Rowling/Glinner/other TERFs split from the mainstream left. Or why Glenn Greenwald is considered a "Nazi" to the leftists.