It's not Seattle as a whole. It's not even a "major portion" of Seattle. It's 6 blocks, total. The rapper is not the warlord, there is no warlord. Antifa isn't running it, antifa doesn't want to run anything, because antifa means anti-fascist and anti-fascists are, by definition, against dictatorships.
Here's what appears to be a hybrid op-ed/dramatic documentary-style article about what's going on in CHAZ (the autonomous zone where this is taking place):
What’s Going On in CHAZ, the Seattle Autonomous Zone?