"Everything is political" is a way for stupid people to feel less stupid. Nothing more. When stupid people see smart people figure out complex patterns or see subtleties in things, their takeaway is "reading into things is what smart people do". Thing is, you can read anything into anything.
Let's say I'm writing a book, and I want to show the reader that Population A is a brutal, violent society. I have zero desire to have them represent anything in the real world. I just want to make a fake population the reader can hate. How would I do that?
If they're slavers, people are going to think they represent American slavery. If gangs run rampant in their society, people are going to think I'm making a commentary on specific, real life gangs. Class divide? Capitalism. Genocide? Holocaust. Dictator? Orange Man. A bizarre ritual where they throw an iguana into a boiling cauldron of Tang and then pour it on their enemies while juggling? They'll think of something it "totally represents". No matter what I do, they can read allegory into it, even if none exists.
The only intelligent thing to do is throw "death of the author" right in the garbage where it belongs and let the author's thoughts and feelings do the talking, even if not explicitly. If someone who really hates Ukrainians makes a movie where The Nobrainians are constantly fucking everything up, odds are it's a metaphor. Otherwise, it's just a funny movie about a fictional bunch of stupid people.