AFL coverage is also likely impacted by ex-AFL players getting jobs with the media. Matthew Pavlich gets a nightly segment on channel nine, Michael Thomson is head of sports coverage and had a career calling WAFL games before the VFL expansion. Basil Zemplas is an AFL shill and has a job at 7, Dennis Cometti is basically a likeable AFL version of Gus and he was the chief AFL commentator for something like 40 years. Credit where credit is due the AFL have done a lot of work to control WA, but there's still plenty of folks hate it.
Worth mentioning regarding other non-AFL sports teams in Perth; the Glory, Force, Wildcats and Scorchers all used to get next to nothing in terms of coverage, wasn't until the FFA, WARU, CA and NBL actually started calling them out on it that they changed their tune. Now there's weekly articles on the Force in the West Australian. Glory and in turn soccer has had a huge increase in coverage ever since they started hosting EPL teams for friendlies, Scorchers have dominated the Big Bash League for the last few years and still get average coverage. Same for the Wildcats, most dominant basketball team in Australia and most news stories about basketball are about people born in Australia who move to the US at age five playing in an NBA team and how somehow that gets spun as "A win or Australia".