The first tweet says everything I just stated... That it wasn't about King County's rules, but rather UW simply couldn't field a team due to tests last week and over the weekend. The positive tests may have continued into yesterday morning, but there was no way they were just miraculously going to be all good to go.
The second tweet was two days prior to the Wilner Tweet I posted, before his "source" told him that UW wasn't even close, so I'm not sure why that's relevant. King County rules may have come into play if the team wasn't actually experiencing a massive outbreak, but they were and there was zero chance they were going to play in the CCG.
The conference should have gotten ahead of it, forced them to announce on Sunday, and then scheduled the matchups after. Honestly, they could have done the same thing yesterday after the UW announcement, but for some reason, they don't feel the need to give the second best team (by record) in the conference a game. They'd rather give games to Utah and ASU, two teams that were at the crux of the Pac 12 COVID issues that caused a lot of this bull**** in the first place.