One way we could measure bias in political articles would be to count how much of an article is sources by each news papers and then measure total media bias through establish finding in media bias research. A common cited sources is the study done during the 2016 US election which estimated media bias for each major news paper by looking at social media links where the profile were openly set as being in support to one specific political party. The more links that was shared by a single political aligned demographic, the more aligned the study would define the news paper.

Back to the specific at hands, it is difficult to build a case based on the sum of reliable sourced information without an actually edit dispute. One of the first layers in Wikipedia in order to address issues is through a third-party, and one would have to ask them to decide if the sum of sources are given correct weight in the article. Looking at Max page myself I can't say if the article is correctly reflecting reliable sources or not. I am surprised there even exist 121 distinct reliable sources about a political writer/political documentary maker. If anything the article looks very bloated and should be trimmed down to match subject matters of similar notability. I think there are noble price winners that has less coverage than this person.