As for demographics: you're not building a team based on the demographics of your region. If that was the case then USC and UCLA would have a Los in front of their name. It would also mean that half of Washington's population is Poly.
Except for you are building a team based off of this in many instances...
What the fuck does that even mean? Are you trying to say college football teams build their roster based on the demographics of their region?
The rosters are highly impacted by demographics within their recruiting footprint, yes. How is this a hot take? Why does Florida's roster not have any Polynesians or Chinese or whatever? Why do the SEC teams have more black players in general?
Demographics matter when you're not allowed to venture more than a day's drive from your campus.
The sample size is too small to be very meaningful, but since you mentioned Florida:
Florida white recruits signed 2018+2019: 7
Oregon white recruits signed 2018+2019: 8
Florida population % white: 57%
Oregon population % white: 78%
Washington white recruits signed: 2018+19: 11
Washington population % white: 71%
I'm not going to waste too much time on this, but a quick look shows that SEC scholarship players and Pac-12 scholarship players are demographically similar. In some cases your guess that SEC teams have more black players is wrong - Alabama has signed more white players, at a higher percentage, than Oregon over the past couple of cycles. Alabama is the state with the 6th highest percentage of black people, while Oregon is 41st.
There are going to be regional differences, like the Poly population being in the Pac-12 footprint. Demographics do play a role, especially with walk-ons, but in a world with Hudl and airplanes they aren't a limiting factor.
But I think you're entirely missing the point: it's not just about Washinton's roster make-up. The issue is what people are talking about, accurate or not, and that's not confined to this shit show.